/* style.css - bantron.ai Mobile-First Design */

@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Sora:wght@300;400;600;800&display=swap');

:root {
    /* Color Palette - Bold Vietnamese Street Food Vibes */
    --primary: #FF4500;
    --primary-dark: #CC3700;
    --secondary: #FFD700;
    --accent: #00D9FF;
    --dark: #1A1A2E;
    --darker: #0F0F1E;
    --light: #F8F9FA;
    --gray: #6C757D;
    --gray-light: #E9ECEF;
    --success: #28A745;
    --danger: #DC3545;
    
    /* Typography */
    --font-display: 'Sora', sans-serif;
    --font-mono: 'Space Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(255, 69, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-display);
    background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 100%);
    color: var(--light);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 69, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 217, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-sm);
}

.header {
    position: sticky;
    top: 0;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm);
    border-bottom: 2px solid var(--primary);
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-transform: lowercase;
    letter-spacing: -1px;
}

.logo::before {
    content: '🍻';
    font-size: 1.8rem;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.nav-btn {
    font-family: var(--font-display);
    font-size: 0.9rem;
    padding: 0.6rem 1.2rem;
    background: transparent;
    color: var(--light);
    border: 2px solid var(--primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.nav-btn:hover {
    background: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-btn.primary {
    background: var(--primary);
}

.nav-btn.primary:hover {
    background: var(--primary-dark);
}

.post-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 69, 0, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.post-question {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-question::before {
    content: '💭';
    font-size: 1.5rem;
}

.input-group {
    margin-bottom: var(--spacing-md);
}

.input-label {
    display: block;
    font-size: 0.9rem;
    color: var(--gray-light);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.input-field {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: var(--light);
    font-size: 1rem;
    font-family: var(--font-display);
    transition: all 0.3s ease;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 69, 0, 0.2);
    background: rgba(255, 255, 255, 0.15);
}

.input-field::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.radio-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.radio-option {
    position: relative;
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.radio-option label {
    display: block;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 0.9rem;
}

.radio-option input[type="radio"]:checked + label {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    transform: scale(1.05);
}

.radio-option label:hover {
    border-color: var(--primary);
    background: rgba(255, 69, 0, 0.2);
}

.submit-btn {
    width: 100%;
    padding: 1.2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 800;
    font-family: var(--font-display);
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow-md);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.submit-btn:active {
    transform: translateY(0);
}

.posts-list {
    margin-top: var(--spacing-lg);
}

.post-item {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: all 0.3s ease;
    cursor: pointer;
    animation: slideUp 0.5s ease;
}

.post-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
    border-left-width: 8px;
}

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.post-user {
    font-weight: 700;
    color: var(--secondary);
    font-size: 1rem;
}

.post-time {
    font-size: 0.8rem;
    color: var(--gray);
    font-family: var(--font-mono);
}

.post-content {
    font-size: 1.1rem;
    color: var(--light);
    margin-bottom: var(--spacing-xs);
}

.post-food {
    font-weight: 700;
    color: var(--accent);
}

.post-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
}

.meta-tag {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.comments-section {
    margin-top: var(--spacing-lg);
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.comment-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-left: 3px solid var(--accent);
}

.comment-item.ai-comment {
    background: rgba(0, 217, 255, 0.1);
    border-left-color: var(--accent);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.comment-user {
    font-weight: 600;
    color: var(--accent);
    font-size: 0.9rem;
}

.ai-badge {
    background: var(--accent);
    color: var(--dark);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
}

.comment-content {
    color: var(--light);
    line-height: 1.6;
}

.suggestions-section {
    margin-top: var(--spacing-lg);
}

.suggestion-card {
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 2px solid rgba(255, 215, 0, 0.3);
}

.suggestion-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--spacing-xs);
}

.suggestion-address {
    font-size: 0.9rem;
    color: var(--gray-light);
    margin-bottom: var(--spacing-xs);
}

.suggestion-desc {
    color: var(--light);
    font-size: 0.95rem;
}

.ad-section {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1) 0%, rgba(255, 69, 0, 0.1) 100%);
    border: 2px dashed var(--secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    text-align: center;
}

.ad-label {
    font-size: 0.7rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.ad-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--spacing-xs);
}

.ad-content {
    color: var(--light);
    margin-bottom: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@media (min-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .post-card {
        padding: var(--spacing-lg);
    }
    
    .logo {
        font-size: 2rem;
    }
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.hidden { display: none; }

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    animation: slideUp 0.5s ease;
}

.alert-success {
    background: rgba(40, 167, 69, 0.2);
    border: 2px solid var(--success);
    color: var(--success);
}

.alert-error {
    background: rgba(220, 53, 69, 0.2);
    border: 2px solid var(--danger);
    color: var(--danger);
}