/* 
 * PHY-CLUB - Main Stylesheet
 * A bold, fitness-inspired design with Fight Club vibes
 */

/* ================================
   CSS Variables & Theme
   ================================ */
:root {
    /* Primary palette - Bold reds and blacks */
    --color-primary: #dc2626;
    --color-primary-light: #ef4444;
    --color-primary-dark: #b91c1c;
    --color-primary-glow: rgba(220, 38, 38, 0.3);
    
    /* Accent - Electric yellow */
    --color-accent: #facc15;
    --color-accent-light: #fde047;
    --color-accent-dark: #eab308;
    
    /* Success/Warning/Error */
    --color-success: #22c55e;
    --color-success-bg: rgba(34, 197, 94, 0.1);
    --color-warning: #f59e0b;
    --color-warning-bg: rgba(245, 158, 11, 0.1);
    --color-error: #ef4444;
    --color-error-bg: rgba(239, 68, 68, 0.1);
    
    /* Neutrals - Dark industrial */
    --color-bg: #0a0a0a;
    --color-bg-elevated: #141414;
    --color-bg-card: #1a1a1a;
    --color-bg-input: #0f0f0f;
    
    --color-text: #fafafa;
    --color-text-muted: #a3a3a3;
    --color-text-subtle: #737373;
    
    --color-border: #262626;
    --color-border-light: #404040;
    
    /* Typography */
    --font-display: 'Bebas Neue', Impact, sans-serif;
    --font-primary: 'Barlow', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px var(--color-primary-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* ================================
   Reset & Base
   ================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: 
        radial-gradient(ellipse at 50% 0%, rgba(220, 38, 38, 0.08) 0%, transparent 50%);
    background-attachment: fixed;
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent);
}

/* ================================
   Navigation
   ================================ */
.site-header {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.75rem;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

.nav-logo:hover { color: var(--color-text); }
.logo-icon { font-size: 1.5rem; }
.logo-accent { color: var(--color-primary); }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--color-text-muted);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link-admin { color: var(--color-accent); }

.nav-link-login {
    background: var(--color-primary);
    color: white;
}

.nav-link-login:hover {
    background: var(--color-primary-light);
    color: white;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-username {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.logout-form { display: inline; }

.nav-link-logout {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

/* Mobile Nav */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
}

.mobile-nav {
    display: none;
    flex-direction: column;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav.active { display: flex; }

.mobile-nav-link {
    padding: var(--space-md);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-toggle { display: flex; }
}

/* ================================
   Main Content
   ================================ */
.main-content { flex: 1; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

/* ================================
   Hero Section
   ================================ */
.hero-section {
    position: relative;
    padding: var(--space-3xl) var(--space-lg);
    text-align: center;
    overflow: hidden;
    border-bottom: 1px solid var(--color-border);
}

.hero-background {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(220, 38, 38, 0.1) 0%, transparent 100%);
}

.hero-content {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: var(--space-md);
}

.hero-title-main {
    font-family: var(--font-display);
    font-size: clamp(4rem, 15vw, 8rem);
    letter-spacing: 0.1em;
    line-height: 1;
    display: block;
}

.hero-title-main .accent { color: var(--color-primary); }

.hero-tagline {
    font-family: var(--font-primary);
    font-size: 1.125rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: var(--space-sm);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.hero-cta { margin-top: var(--space-xl); }

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    color: white;
}

.btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-border-light);
    color: var(--color-text);
}

.btn-danger {
    background: var(--color-error);
    color: white;
}

.btn-danger-outline {
    background: transparent;
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.btn-vote {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-voted {
    background: var(--color-success);
    color: white;
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.0625rem;
}

.btn-full { width: 100%; }
.btn-sm { padding: var(--space-xs) var(--space-md); font-size: 0.8125rem; }

/* ================================
   Challenge Section
   ================================ */
.current-challenge-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
}

.section-header {
    margin-bottom: var(--space-lg);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.status-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.status-active { background: var(--color-success-bg); color: var(--color-success); }
.status-upcoming { background: var(--color-warning-bg); color: var(--color-warning); }
.status-ended { background: rgba(255, 255, 255, 0.1); color: var(--color-text-muted); }

.challenge-type-badge {
    font-size: 0.875rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
}

.type-time { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.type-distance { background: rgba(34, 197, 94, 0.2); color: #4ade80; }

.challenge-target {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-top: var(--space-sm);
}

.challenge-target-large {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.challenge-description {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.challenge-actions { margin-top: var(--space-xl); }

/* ================================
   Countdown Timer
   ================================ */
.countdown-container {
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin: var(--space-lg) 0;
    border: 1px solid var(--color-border);
    text-align: center;
}

.countdown-compact { padding: var(--space-lg); }

.countdown-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.countdown-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.countdown-segment {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 70px;
}

.countdown-value {
    font-family: var(--font-mono);
    font-size: clamp(1.75rem, 6vw, 3rem);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.countdown-unit {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-xs);
}

.countdown-separator {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--color-text-subtle);
    line-height: 1;
    opacity: 0.5;
}

/* ================================
   Leaderboard
   ================================ */
.leaderboard-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-2xl);
}

.stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.stat-item { text-align: center; }

.stat-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.leaderboard-table {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.leaderboard-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
    color: inherit;
}

.leaderboard-row:hover {
    background: var(--color-bg);
    transform: translateX(4px);
    color: inherit;
}

.leaderboard-row.rank-1 {
    background: linear-gradient(90deg, rgba(255, 215, 0, 0.15) 0%, var(--color-bg-elevated) 100%);
    border-left: 3px solid gold;
}

.leaderboard-row.rank-2 {
    background: linear-gradient(90deg, rgba(192, 192, 192, 0.1) 0%, var(--color-bg-elevated) 100%);
    border-left: 3px solid silver;
}

.leaderboard-row.rank-3 {
    background: linear-gradient(90deg, rgba(205, 127, 50, 0.1) 0%, var(--color-bg-elevated) 100%);
    border-left: 3px solid #cd7f32;
}

/* Submission Trend Graph */
.submission-trend-graph {
    flex: 1;
    min-width: 120px;
    max-width: 200px;
    height: 40px;
    margin: 0 var(--space-md);
    position: relative;
    display: flex;
    align-items: center;
}

.trend-svg {
    width: 100%;
    height: 100%;
    display: block;
}

.trend-svg polyline {
    stroke-linecap: round;
    stroke-linejoin: round;
}

.trend-svg circle {
    transition: r 0.2s ease;
}

.leaderboard-row:hover .trend-svg circle {
    r: 2;
}

/* Trend colors */
.submission-trend-graph.trend-improving {
    color: var(--color-success);
}

.submission-trend-graph.trend-declining {
    color: var(--color-error);
}

.submission-trend-graph.trend-neutral {
    color: var(--color-text-muted);
}

.rank-badge { min-width: 48px; text-align: center; }
.medal { font-size: 1.5rem; }
.rank-number { font-family: var(--font-mono); font-weight: 700; color: var(--color-text-muted); }

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex: 1;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-avatar img { width: 100%; height: 100%; object-fit: cover; }

.avatar-placeholder {
    color: white;
    font-weight: 700;
    font-size: 1rem;
}

.user-name { font-weight: 600; }

.proof-badge {
    font-size: 0.875rem;
    opacity: 0.7;
}

.time-display { text-align: right; }

.time-value {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-accent);
}

.time-date {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.leaderboard-more { text-align: center; margin-top: var(--space-lg); }

.empty-leaderboard { text-align: center; padding: var(--space-2xl); }
.empty-message { color: var(--color-text-muted); }

/* ================================
   Voting Section
   ================================ */
.voting-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-accent);
    margin-bottom: var(--space-2xl);
}

.voting-group { margin-bottom: var(--space-xl); }
.voting-date { color: var(--color-text-muted); margin-bottom: var(--space-md); }

.voting-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.voting-option {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
}

.voting-option.voted { border-color: var(--color-success); }

.voting-option:hover { border-color: var(--color-border-light); }

.option-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.option-header h4 { font-size: 1.125rem; }

.option-type {
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.option-description {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.option-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.vote-count { font-size: 0.875rem; color: var(--color-text-muted); }

/* Voting Page Styles */
.voting-group-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-xl);
}

.voting-group-header {
    margin-bottom: var(--space-xl);
}

.voting-group-header h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.05em;
}

.voting-hint {
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
}

.voting-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.voting-option-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
}

.voting-option-card.voted {
    border-color: var(--color-success);
    background: rgba(34, 197, 94, 0.05);
}

.option-type-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
}

.option-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-xs);
}

.option-target {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.option-votes {
    margin: var(--space-lg) 0;
}

.vote-bar {
    height: 8px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--space-sm);
}

.vote-fill {
    height: 100%;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.admin-delete { margin-top: var(--space-sm); }

/* ================================
   Chat Section
   ================================ */
.chat-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
}

.chat-form {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.chat-input {
    flex: 1;
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    resize: none;
    min-height: 48px;
}

.chat-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.chat-login-prompt {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.chat-message {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-md);
}

.chat-message-header {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.chat-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.chat-avatar img { width: 100%; height: 100%; object-fit: cover; }

.chat-meta { display: flex; flex-direction: column; }

.chat-username {
    font-weight: 600;
    color: var(--color-text);
}

.chat-time {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
}

.chat-content {
    margin-left: calc(36px + var(--space-md));
    color: var(--color-text-muted);
}

.chat-reactions {
    margin-left: calc(36px + var(--space-md));
    margin-top: var(--space-sm);
    display: flex;
    gap: var(--space-sm);
}

.reaction-btn {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-muted);
}

.reaction-btn:hover { background: var(--color-border); }
.reaction-btn.active { background: var(--color-primary); border-color: var(--color-primary); color: white; }

.reaction-display {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-sm);
}

.empty-chat {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-xl);
}

/* ================================
   Challenge Cards
   ================================ */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    letter-spacing: 0.05em;
}

.challenges-section { margin-bottom: var(--space-2xl); }

.section-subtitle {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
}

.status-dot.active { background: var(--color-success); box-shadow: 0 0 8px var(--color-success); }
.status-dot.upcoming { background: var(--color-warning); }
.status-dot.past { background: var(--color-text-muted); }

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.challenge-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.challenge-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.challenge-card.active { border-color: var(--color-success); }

.challenge-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.challenge-status {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.challenge-status.active { background: var(--color-success-bg); color: var(--color-success); }
.challenge-status.upcoming { background: var(--color-warning-bg); color: var(--color-warning); }
.challenge-status.past { background: rgba(255, 255, 255, 0.1); color: var(--color-text-muted); }

.challenge-type-small {
    font-size: 0.75rem;
    font-weight: 600;
}

.challenge-card-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-sm);
}

.challenge-card-description {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.challenge-card-dates {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

/* ================================
   Challenge Detail
   ================================ */
.breadcrumb { margin-bottom: var(--space-xl); }
.breadcrumb a { color: var(--color-text-muted); font-size: 0.875rem; }

.challenge-detail-header {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-xl);
    border: 1px solid var(--color-border);
}

.challenge-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.challenge-detail-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.challenge-detail-description {
    color: var(--color-text-muted);
    font-size: 1.0625rem;
    margin-bottom: var(--space-lg);
}

.challenge-dates {
    display: flex;
    gap: var(--space-2xl);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.date-item { display: flex; flex-direction: column; }

.date-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.date-value { font-weight: 600; }

.challenge-detail-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-top: var(--space-xl);
}

.challenge-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.stat-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    border: 1px solid var(--color-border);
}

.stat-card.highlight {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.1) 0%, var(--color-bg-card) 100%);
}

.stat-card-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.stat-card.highlight .stat-card-value { color: var(--color-primary); }

.stat-card-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ================================
   Forms
   ================================ */
.auth-page {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.auth-container { width: 100%; max-width: 420px; }

.auth-card, .form-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.auth-header, .form-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.auth-icon { font-size: 3rem; display: block; margin-bottom: var(--space-md); }

.auth-title, .form-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.auth-subtitle, .form-subtitle { color: var(--color-text-muted); }

.form-page { max-width: 600px; margin: 0 auto; }

.styled-form { display: flex; flex-direction: column; gap: var(--space-lg); }

.form-group { display: flex; flex-direction: column; gap: var(--space-sm); }

.form-label { font-weight: 600; font-size: 0.875rem; }

.form-input, .form-select {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-input:focus, .form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-input::placeholder { color: var(--color-text-subtle); }

.form-textarea { resize: vertical; min-height: 100px; }

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
}

.form-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
    margin-top: var(--space-md);
}

.form-actions.centered { justify-content: center; }

.form-hint { font-size: 0.8125rem; color: var(--color-text-muted); }

.validation-summary {
    background: var(--color-error-bg);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    color: var(--color-error);
    font-size: 0.875rem;
}

.validation-message { color: var(--color-error); font-size: 0.8125rem; }

.auth-footer { margin-top: var(--space-xl); text-align: center; }

.auth-hint {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
}

.skip-link { text-align: center; margin-top: var(--space-lg); }
.skip-link a { color: var(--color-text-muted); font-size: 0.875rem; }

/* Challenge Type Selector */
.challenge-type-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.type-option input { display: none; }

.type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.type-option input:checked + .type-card {
    border-color: var(--color-primary);
    background: rgba(220, 38, 38, 0.1);
}

.type-icon { font-size: 2rem; }
.type-name { font-weight: 600; }
.type-desc { font-size: 0.75rem; color: var(--color-text-muted); }

/* Distance/Time Inputs */
.distance-input-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.distance-input-group .form-input { flex: 1; }
.distance-input-group .form-select { width: 120px; }
.input-suffix { color: var(--color-text-muted); font-size: 0.875rem; }

.quick-distances {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-sm);
}

.quick-btn {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-xs) var(--space-md);
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quick-btn:hover, .quick-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* Time Input */
.time-input-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.time-segment { display: flex; flex-direction: column; align-items: center; }

.time-input {
    width: 80px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
}

.time-input-small { width: 60px; }

.time-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    margin-top: var(--space-xs);
}

.time-colon, .time-dot {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-muted);
}

.time-preview {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
}

.preview-label { font-size: 0.875rem; color: var(--color-text-muted); margin-right: var(--space-sm); }

.preview-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

/* File Upload */
.file-upload { position: relative; }
.file-upload.centered { text-align: center; }
.file-input { display: none; }

.file-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-label:hover { border-color: var(--color-primary); }
.file-label.large { padding: var(--space-xl); }
.file-icon { font-size: 1.5rem; }
.file-text { color: var(--color-text-muted); }
.file-name { display: block; margin-top: var(--space-sm); color: var(--color-primary); font-size: 0.875rem; }

/* ================================
   Profile
   ================================ */
.profile-page { max-width: 800px; margin: 0 auto; }

.profile-header {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-xl);
    border: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.profile-avatar-large {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.profile-avatar-large img { width: 100%; height: 100%; object-fit: cover; }

.avatar-placeholder-large { color: white; font-weight: 700; font-size: 3rem; }

.profile-info { flex: 1; min-width: 200px; }

.profile-name {
    font-family: var(--font-display);
    font-size: 2rem;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-xs);
}

.profile-username { color: var(--color-text-muted); margin-bottom: var(--space-sm); }

.profile-details {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-sm);
}

.profile-detail {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.profile-bio { margin-bottom: var(--space-sm); }
.profile-referral { font-size: 0.875rem; color: var(--color-text-muted); }
.profile-member-since { font-size: 0.875rem; color: var(--color-text-subtle); }

.profile-actions { flex-shrink: 0; }

.profile-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.profile-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
}

.submission-history { display: flex; flex-direction: column; gap: var(--space-md); }

.submission-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-fast);
}

.submission-card:hover { background: var(--color-bg-elevated); color: inherit; }

.submission-challenge { flex: 1; }
.submission-title { font-weight: 600; display: block; }
.submission-target { font-size: 0.875rem; color: var(--color-text-muted); }

.submission-result { text-align: right; }

.submission-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
    display: block;
}

.submission-date { font-size: 0.875rem; color: var(--color-text-muted); }

/* Profile Picture Upload */
.profile-picture-section {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.current-picture {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    overflow: hidden;
    flex-shrink: 0;
}

.current-picture-img { width: 100%; height: 100%; object-fit: cover; }

.current-picture-placeholder {
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
}

.picture-actions { display: flex; gap: var(--space-sm); }
.picture-hint { font-size: 0.8125rem; color: var(--color-text-muted); flex-basis: 100%; margin-top: var(--space-sm); }

/* Submission Details */
.submission-detail { max-width: 800px; margin: 0 auto; }

.submission-user-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-xl);
    border: 1px solid var(--color-border);
    text-align: center;
}

.user-link { text-decoration: none; color: inherit; }

.user-avatar-large {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
}

.user-avatar-large img { width: 100%; height: 100%; object-fit: cover; }

.user-name-large {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-sm);
}

.user-info-details { font-size: 0.875rem; color: var(--color-text-muted); margin-bottom: var(--space-sm); }
.user-bio { color: var(--color-text-muted); max-width: 400px; margin: 0 auto; }

.submission-details-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.detail-item { text-align: center; }

.detail-item.highlight {
    background: rgba(220, 38, 38, 0.1);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
}

.detail-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: var(--space-xs);
}

.detail-value { font-weight: 600; }
.detail-value.large { font-family: var(--font-mono); font-size: 2rem; color: var(--color-accent); }

.submission-notes {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.submission-notes h3 { font-size: 0.875rem; color: var(--color-text-muted); margin-bottom: var(--space-sm); }

.submission-proof { margin-top: var(--space-lg); }
.submission-proof h3 { font-size: 0.875rem; color: var(--color-text-muted); margin-bottom: var(--space-md); }

.proof-image {
    max-width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

/* ================================
   Empty States
   ================================ */
.empty-state { text-align: center; padding: var(--space-3xl); }
.empty-state.small { padding: var(--space-xl); }
.empty-icon { font-size: 4rem; display: block; margin-bottom: var(--space-md); opacity: 0.5; }
.empty-state h2 { font-family: var(--font-display); font-size: 1.5rem; letter-spacing: 0.05em; margin-bottom: var(--space-sm); }
.empty-state p { color: var(--color-text-muted); margin-bottom: var(--space-lg); }

.no-challenge-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.no-challenge-content { text-align: center; padding: var(--space-3xl); }
.no-challenge-icon { font-size: 5rem; display: block; margin-bottom: var(--space-lg); opacity: 0.4; }

/* Upcoming */
.upcoming-section { margin-top: var(--space-2xl); }

.upcoming-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-md);
}

.upcoming-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
}

.upcoming-type { font-size: 1.5rem; margin-bottom: var(--space-sm); }
.upcoming-title { font-family: var(--font-display); font-size: 1.125rem; letter-spacing: 0.03em; margin-bottom: var(--space-sm); }
.upcoming-target { font-family: var(--font-mono); color: var(--color-accent); font-weight: 600; margin-bottom: var(--space-sm); }
.upcoming-date { font-size: 0.875rem; color: var(--color-text-muted); }

/* ================================
   Error Pages
   ================================ */
.error-page {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.error-container { text-align: center; max-width: 400px; }
.error-icon { font-size: 5rem; display: block; margin-bottom: var(--space-lg); }
.error-title { font-family: var(--font-display); font-size: 2rem; margin-bottom: var(--space-md); }
.error-message { color: var(--color-text-muted); margin-bottom: var(--space-xl); }

/* ================================
   Congratulations Popup
   ================================ */
.congratulations-popup {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease;
}

.congrats-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl);
    border: 2px solid var(--color-primary);
    text-align: center;
    max-width: 400px;
    box-shadow: var(--shadow-glow);
    animation: slideUp 0.4s ease;
}

.congrats-icon {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    animation: bounce 0.6s ease;
}

.congrats-title {
    font-family: var(--font-display);
    font-size: 2rem;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.congrats-message {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ================================
   Toast Notifications
   ================================ */
.toast {
    position: fixed;
    top: var(--space-xl);
    right: var(--space-xl);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 500;
    cursor: pointer;
    z-index: 1000;
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 4.7s forwards;
    box-shadow: var(--shadow-lg);
}

.toast-success { background: var(--color-success); color: white; }
.toast-error { background: var(--color-error); color: white; }
.toast-icon { font-size: 1.25rem; }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* ================================
   Footer
   ================================ */
.site-footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-tagline {
    font-style: italic;
    margin-bottom: var(--space-sm);
}

/* ================================
   Submission Actions
   ================================ */
.submission-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.current-proof {
    max-width: 300px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.current-proof-img {
    width: 100%;
    height: auto;
    display: block;
}

.delete-btn {
    background: transparent;
    color: var(--color-error);
    border-color: var(--color-error);
}

.delete-btn:hover {
    background: var(--color-error);
    color: white;
}

/* ================================
   Responsive
   ================================ */
@media (max-width: 768px) {
    .hero-section { padding: var(--space-2xl) var(--space-md); }
    .container { padding: var(--space-lg) var(--space-md); }
    
    .current-challenge-section,
    .leaderboard-section,
    .challenge-detail-header,
    .profile-header,
    .profile-section,
    .chat-section,
    .voting-section,
    .voting-group-section { padding: var(--space-lg); }
    
    .countdown-segment { min-width: 50px; }
    .countdown-value { font-size: 1.5rem; }
    
    .profile-header { flex-direction: column; text-align: center; }
    .profile-info { text-align: center; }
    
    .form-actions { flex-direction: column; }
    .form-actions .btn { width: 100%; }
    
    .chat-form { flex-direction: column; }
    
    .toast { left: var(--space-md); right: var(--space-md); }
    
    .challenge-type-selector { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .leaderboard-row { flex-wrap: wrap; gap: var(--space-sm); }
    .user-info { flex: 1 0 100%; order: 1; }
    .rank-badge { order: 0; }
    .time-display { order: 2; margin-left: auto; }
    .time-input-group { justify-content: center; }
}