/* CSS Design System for Grammar Studio Landing Page */

/* Custom Typography - Import Outfit */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* Color Variables */
:root {
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Light Mode Palette */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #7c3aed;
    --secondary-hover: #6d28d9;
    --accent-color: #f43f5e;
    --accent-bg: #ffe4e6;
    --success-color: #10b981;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --surface-hover: #f1f5f9;
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-white: #ffffff;
    
    /* Effects */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(226, 232, 240, 0.8);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --glow-primary: 0 0 20px rgba(79, 70, 229, 0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* Dark Mode Palette overrides */
html.dark {
    --primary-color: #818cf8;
    --primary-hover: #6366f1;
    --secondary-color: #a78bfa;
    --secondary-hover: #8b5cf6;
    --accent-color: #fb7185;
    --accent-bg: #881337;
    --success-color: #34d399;
    --bg-color: #0b0f19;
    --surface-color: #151f32;
    --surface-hover: #1e293b;
    --border-color: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Effects */
    --glass-bg: rgba(11, 15, 25, 0.7);
    --glass-border: rgba(30, 41, 59, 0.8);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    --glow-primary: 0 0 20px rgba(129, 140, 248, 0.2);
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.5rem;
}

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

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
}

.text-center { text-align: center; }
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Language switching rules */
.lang-en, .lang-vi, .lang-es, .lang-ja {
    display: none !important;
}

html[lang="en"] .lang-en { display: block !important; }
html[lang="vi"] .lang-vi { display: block !important; }
html[lang="es"] .lang-es { display: block !important; }
html[lang="ja"] .lang-ja { display: block !important; }

html[lang="en"] span.lang-en, html[lang="en"] a.lang-en { display: inline-flex !important; }
html[lang="vi"] span.lang-vi, html[lang="vi"] a.lang-vi { display: inline-flex !important; }
html[lang="es"] span.lang-es, html[lang="es"] a.lang-es { display: inline-flex !important; }
html[lang="ja"] span.lang-ja, html[lang="ja"] a.lang-ja { display: inline-flex !important; }



/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-white);
    box-shadow: var(--shadow-md), var(--glow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 25px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--surface-hover);
    transform: translateY(-2px);
}

/* App Store Badge Button styling */
.app-store-badge {
    display: inline-flex;
    align-items: center;
    background-color: #000000;
    color: #ffffff;
    padding: 0.6rem 1.5rem;
    border-radius: 12px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-weight: 600;
    transition: all var(--transition-fast);
    border: 1px solid rgba(255,255,255,0.1);
}

.app-store-badge svg {
    margin-right: 10px;
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.app-store-badge .badge-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.1;
}

.app-store-badge .badge-text span {
    font-size: 0.65rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.app-store-badge .badge-text strong {
    font-size: 1.05rem;
    font-weight: 600;
}

.app-store-badge:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background-color: #111111;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4.5rem;
}

.logo-link {
    display: flex;
    align-items: center;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--text-primary);
    gap: 0.5rem;
}

.logo-img {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

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

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Language and Dark/Light Mode Toggles */
.toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    transition: all var(--transition-fast);
}

.toggle-btn:hover {
    background-color: var(--surface-hover);
    border-color: var(--primary-color);
}

.toggle-btn svg {
    width: 1.25rem;
    height: 1.25rem;
}

.lang-switch {
    font-family: inherit;
    font-weight: 600;
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-switch:hover {
    border-color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 8rem 0 5rem 0;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.4rem 1rem;
    background-color: var(--accent-bg);
    color: var(--accent-color);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-mockup-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-mockup-bg {
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.1) 0%, rgba(0,0,0,0) 70%);
    z-index: -1;
}

.phone-frame {
    width: 280px;
    height: 570px;
    border: 10px solid #1e293b;
    border-radius: 40px;
    background-color: #0b0f19;
    box-shadow: var(--shadow-lg), 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    overflow: hidden;
    position: relative;
    transition: border-color var(--transition-normal);
}

html.dark .phone-frame {
    border-color: #334155;
}

.phone-screen {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, #1e1b4b 0%, #0f0728 100%);
    color: #ffffff;
    padding: 1.5rem;
    font-family: var(--font-sans);
    position: relative;
}

/* Phone Mockup Content UI */
.phone-notch {
    width: 110px;
    height: 20px;
    background-color: #1e293b;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

html.dark .phone-notch {
    background-color: #334155;
}

.phone-header {
    margin-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    opacity: 0.8;
}

.phone-app-logo {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 1.5rem;
}

.phone-app-logo img {
    width: 1.8rem;
    height: 1.8rem;
    border-radius: 6px;
}

.phone-streak-badge {
    background: rgba(244, 63, 94, 0.2);
    border: 1px solid rgba(244, 63, 94, 0.4);
    color: #fb7185;
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
}

.phone-card {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1rem;
    margin-top: 1.2rem;
    backdrop-filter: blur(5px);
}

.phone-card-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #a78bfa;
    margin-bottom: 0.2rem;
}

.phone-card-content {
    font-size: 0.95rem;
    font-weight: 600;
}

.phone-progress-bar {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-top: 0.6rem;
    overflow: hidden;
}

.phone-progress-fill {
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, #6366f1, #a78bfa);
    border-radius: 10px;
}

.phone-lessons {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-top: 1.2rem;
}

.phone-lesson-row {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 12px;
    padding: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.2s;
}

.phone-lesson-info {
    display: flex;
    flex-direction: column;
}

.phone-lesson-name {
    font-size: 0.85rem;
    font-weight: 600;
}

.phone-lesson-level {
    font-size: 0.7rem;
    opacity: 0.6;
}

.phone-lesson-status {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid #818cf8;
    display: flex;
    align-items: center;
    justify-content: center;
}

.phone-lesson-status.completed {
    background-color: #10b981;
    border-color: #10b981;
}

.phone-lesson-status.completed::after {
    content: "✓";
    font-size: 0.6rem;
    color: #ffffff;
    font-weight: bold;
}

/* Features Section */
.features-header {
    max-width: 600px;
    margin: 0 auto 4rem auto;
}

.features-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.features-desc {
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 14px;
    background-color: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    transition: background-color var(--transition-fast);
}

.feature-card:hover .feature-icon {
    background-color: var(--primary-color);
    color: #ffffff;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Split Showcase Section */
.showcase-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
    margin-bottom: 6rem;
}

.showcase-row:nth-child(even) {
    direction: rtl;
}

.showcase-row:nth-child(even) .showcase-content {
    direction: ltr;
}

.showcase-image-wrapper {
    display: flex;
    justify-content: center;
}

.showcase-content h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 1.2rem;
}

.showcase-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.showcase-features-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.showcase-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.showcase-feature-bullet {
    margin-top: 0.2rem;
    color: var(--success-color);
    font-weight: bold;
}

.showcase-feature-text h4 {
    font-size: 1.05rem;
    font-weight: 600;
}

.showcase-feature-text p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* FAQ Section */
.faq-header {
    max-width: 600px;
    margin: 0 auto 3.5rem auto;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    user-select: none;
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    color: var(--text-secondary);
    transition: all var(--transition-normal) ease-in-out;
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem 1.5rem;
    max-height: 200px; /* arbitrary height to slide down */
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-fast);
    display: inline-block;
    color: var(--text-muted);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--primary-color);
}

/* Call to Action Section */
.cta {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
    border-radius: 32px;
    padding: 5rem 2rem;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.cta-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.05) 0%, rgba(0,0,0,0) 50%);
    z-index: 0;
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.cta-desc {
    color: var(--text-secondary);
    font-size: 1.15rem;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Subpages - Privacy & Terms layout */
.subpage-container {
    padding: 8rem 0 6rem 0;
    max-width: 800px;
}

.subpage-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.subpage-date {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 3rem;
}

.subpage-content {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--shadow-sm);
}

.subpage-content h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.subpage-content p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.subpage-content ul, .subpage-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.subpage-content li {
    margin-bottom: 0.5rem;
}

.lang-block {
    display: none;
}

.lang-block.lang-active {
    display: block;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--surface-color);
    padding: 4rem 0 2rem 0;
    transition: background-color var(--transition-normal);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 1rem;
    max-width: 250px;
    font-size: 0.95rem;
}

.footer-title {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-link {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-link:hover {
    color: var(--primary-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .showcase-row {
        grid-template-columns: 1fr;
        gap: 3rem;
        margin-bottom: 4rem;
    }
    
    .showcase-row:nth-child(even) {
        direction: ltr;
    }
    
    .showcase-image-wrapper {
        order: 2;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .nav-menu {
        display: none; /* simple toggle handled by mobile CSS or hide for brevity */
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-brand {
        text-align: center;
    }
    
    .footer-brand p {
        margin-left: auto;
        margin-right: auto;
    }
    
    .footer-grid > div:not(.footer-brand) {
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .subpage-content {
        padding: 1.5rem;
    }
    
    .subpage-title {
        font-size: 2.2rem;
    }
}

/* Support Page & Diagnostic Component Styling */
.support-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.support-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.support-card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: inline-block;
    padding: 0.5rem;
    border-radius: 12px;
    background: var(--bg-color);
}

.diagnostic-box {
    background: rgba(129, 140, 248, 0.08);
    border: 1px solid rgba(129, 140, 248, 0.25);
    border-radius: 12px;
    padding: 1.25rem;
    margin: 1.5rem 0;
}

.diagnostic-box h4 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.contact-card {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    border: 1px solid rgba(129, 140, 248, 0.3);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #ffffff !important;
    font-weight: 600;
    padding: 0.85rem 1.75rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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