/*
 * Siliang AI LAB - Premium AI Platform Style
 * 配色: AI/Quantum Premium Theme
 * Primary: #7C3AED (紫) | CTA: #06B6D4 (青) | Accent: #8B5CF6
 */

/* ==================== CSS Variables ==================== */
:root {
    /* 主色系 - 紫色 */
    --primary: #7C3AED;
    --primary-light: #A78BFA;
    --primary-dark: #6D28D9;
    --primary-glow: rgba(124, 58, 237, 0.4);

    /* 次色系 - 青色 */
    --secondary: #06B6D4;
    --secondary-light: #22D3EE;
    --secondary-dark: #0891B2;

    /* 强调色 */
    --accent: #8B5CF6;
    --accent-light: #C4B5FD;
    --cta: #06B6D4;
    --cta-hover: #0891B2;

    /* 背景色 - 深色系 */
    --bg-primary: #0A0A0F;
    --bg-secondary: #12121A;
    --bg-tertiary: #1A1A24;
    --bg-card: rgba(26, 26, 36, 0.8);
    --bg-elevated: rgba(30, 30, 42, 0.9);

    /* 文字色 */
    --text-primary: #F8FAFC;
    --text-secondary: #E2E8F0;
    --text-muted: #94A3B8;
    --text-dark: #64748B;

    /* 边框和效果 */
    --border: rgba(124, 58, 237, 0.15);
    --border-light: rgba(124, 58, 237, 0.25);
    --glass-bg: rgba(124, 58, 237, 0.05);
    --glass-border: rgba(124, 58, 237, 0.2);

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px rgba(124, 58, 237, 0.3);
    --shadow-glow-cyan: 0 0 60px rgba(6, 182, 212, 0.2);

    /* 尺寸 */
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-sm: 8px;

    /* 过渡 */
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ==================== Landing Page ==================== */
.landing {
    min-height: 100vh;
    background: var(--bg-primary);
    position: relative;
    overflow-x: hidden;
}

/* 背景装饰 */
.landing::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(124, 58, 237, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 100% 100%, rgba(6, 182, 212, 0.1), transparent),
        radial-gradient(ellipse 40% 30% at 0% 80%, rgba(139, 92, 246, 0.08), transparent);
    pointer-events: none;
    z-index: 0;
}

.landing-content {
    position: relative;
    z-index: 1;
}

/* ==================== Navigation ==================== */
.landing-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 1rem 2rem;
    background: rgba(10, 10, 15, 0.95);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.landing-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.landing-logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1rem;
}

.landing-nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.landing-nav-link {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: var(--transition);
}

.landing-nav-link:hover {
    color: var(--text-primary);
}

.landing-nav-actions {
    display: flex;
    gap: 0.75rem;
}

/* ==================== Hero Section ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    position: relative;
}

.hero-content {
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(124, 58, 237, 0.1);
    border: 1px solid var(--border-light);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--primary-light);
    margin-bottom: 1.5rem;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--secondary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 50%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-en {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 0.5rem;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.hero-subtitle-en {
    font-size: 0.85rem;
    color: var(--text-muted);
    max-width: 500px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px var(--primary-glow);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: rgba(124, 58, 237, 0.1);
    border-color: var(--primary);
    color: var(--text-primary);
}

.btn-cta {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: white;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(6, 182, 212, 0.4);
    color: white;
}

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

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-block {
    width: 100%;
}

/* ==================== Section Styles ==================== */
.section {
    padding: 5rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.section-title-en {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ==================== Pricing Grid ==================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.pricing-card.featured::before {
    content: '推荐';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 0.7rem;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
}

.pricing-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.pricing-name-en {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.pricing-price {
    font-size: 2.25rem;
    font-weight: 800;
    margin: 1rem 0;
    color: var(--text-primary);
}

.pricing-price span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 1.5rem;
}

.pricing-features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pricing-features li::before {
    content: '✓';
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.75rem;
}

/* ==================== Projects Section ==================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.project-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--border);
}

.project-content {
    padding: 1.25rem;
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.project-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.project-status {
    font-size: 0.7rem;
    padding: 0.25rem 0.6rem;
    border-radius: 100px;
    font-weight: 500;
}

.project-status.online {
    background: rgba(34, 197, 94, 0.15);
    color: #22C55E;
}

.project-status.dev {
    background: rgba(251, 191, 36, 0.15);
    color: #FBBF24;
}

.project-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.project-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.project-link {
    color: var(--primary-light);
    font-size: 0.85rem;
    font-weight: 500;
}

.project-link:hover {
    color: var(--secondary);
}

.project-version {
    color: var(--text-dark);
    font-size: 0.75rem;
}

/* ==================== Pricing Section ==================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.pricing-card.featured::before {
    content: '推荐';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 0.7rem;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
}

.pricing-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pricing-name-en {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.pricing-price {
    font-size: 2rem;
    font-weight: 800;
    margin: 1rem 0;
    color: var(--text-primary);
}

.pricing-price span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 1.5rem;
}

.pricing-features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pricing-features li::before {
    content: '✓';
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.75rem;
}

/* ==================== Roadmap Section ==================== */
.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    max-width: 1000px;
    margin: 0 auto;
}

.roadmap-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: var(--transition);
}

.roadmap-item:hover {
    border-color: var(--border-light);
}

.roadmap-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(6, 182, 212, 0.2));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.roadmap-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.roadmap-desc {
    color: var(--text-muted);
    font-size: 0.8rem;
    line-height: 1.5;
}

/* ==================== Auth Modal Additional Styles ==================== */
.auth-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.auth-modal-overlay .auth-modal {
    transform: scale(0.95);
}

.auth-modal-overlay.active .auth-modal {
    transform: scale(1);
}

.auth-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    background: var(--bg-tertiary);
    padding: 0.2rem;
    border-radius: var(--radius-sm);
}

.auth-tab {
    flex: 1;
    padding: 0.6rem;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.auth-tab.active {
    background: var(--primary);
    color: white;
}

.auth-tab:hover:not(.active) {
    color: var(--text-primary);
}

.form-footer {
    text-align: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ==================== Footer ==================== */
.footer {
    padding: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ==================== Auth Modal ==================== */
.auth-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 1rem;
}

.auth-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.auth-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 380px;
    width: 100%;
    transform: scale(0.95);
    transition: var(--transition);
    position: relative;
}

.auth-modal-overlay.active .auth-modal {
    transform: scale(1);
}

.auth-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
}

.auth-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.auth-logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
}

.auth-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.auth-subtitle {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.auth-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    background: var(--bg-tertiary);
    padding: 0.2rem;
    border-radius: var(--radius-sm);
}

.auth-tab {
    flex: 1;
    padding: 0.6rem;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.auth-tab.active {
    background: var(--primary);
    color: white;
}

/* ==================== Forms ==================== */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.form-input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: var(--bg-tertiary);
    transition: var(--transition);
    color: var(--text-primary);
}

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

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

.form-error {
    color: #EF4444;
    font-size: 0.8rem;
    margin-top: 0.4rem;
}

.form-success {
    color: #22C55E;
    font-size: 0.8rem;
    margin-top: 0.4rem;
}

.form-footer {
    text-align: center;
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ==================== Header (Dashboard) ==================== */
.header {
    background: rgba(10, 10, 15, 0.95);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    background: rgba(124, 58, 237, 0.1);
    color: var(--text-primary);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}

/* ==================== Dashboard ==================== */
.dashboard {
    padding: 2rem;
    min-height: calc(100vh - 60px);
    max-width: 1200px;
    margin: 0 auto;
}

.welcome-section {
    text-align: center;
    padding: 3rem 0;
}

.welcome-section h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-section p {
    color: var(--text-muted);
}

/* ==================== Admin Section ==================== */
.admin-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-top: 2rem;
}

.admin-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
}

.admin-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

/* ==================== Table ==================== */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tr:hover {
    background: rgba(124, 58, 237, 0.05);
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
}

.badge-admin { background: rgba(124, 58, 237, 0.2); color: var(--primary-light); }
.badge-user { background: rgba(6, 182, 212, 0.2); color: var(--secondary-light); }
.badge-active { background: rgba(34, 197, 94, 0.2); color: #22C55E; }
.badge-inactive { background: rgba(239, 68, 68, 0.2); color: #EF4444; }

/* ==================== Modal ==================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 1rem;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-width: 450px;
    width: 100%;
    transform: scale(0.95);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.25rem;
}

/* ==================== Toast ==================== */
.toast {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 500;
    font-size: 0.85rem;
    z-index: 1001;
    animation: slideIn 0.3s ease;
}

.toast-success { background: linear-gradient(135deg, #059669, #10B981); }
.toast-error { background: linear-gradient(135deg, #DC2626, #EF4444); }

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

/* ==================== Loading Spinner ==================== */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==================== Utilities ==================== */
.text-center { text-align: center; }
.hidden { display: none !important; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .hero-title { font-size: 2rem; }
    .hero { padding: 6rem 1.5rem 3rem; }
    .section { padding: 3rem 1.5rem; }
    .landing-nav { padding: 0.75rem 1rem; }
    .landing-nav-links { display: none; }
    .projects-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .roadmap-grid { grid-template-columns: 1fr 1fr; }
    .header-content { padding: 0 1rem; }
    .dashboard { padding: 1rem; }
    .table { font-size: 0.8rem; }
    .table th, .table td { padding: 0.5rem; }
}

@media (max-width: 480px) {
    .roadmap-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
}