/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #10b981;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --background: #ffffff;
    --background-alt: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --text-color: #f9fafb;
    --text-light: #d1d5db;
    --background: #111827;
    --background-alt: #1f2937;
    --border-color: #374151;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--background);
    line-height: 1.6;
    font-size: 16px;
    margin: 0;
    padding: 0;
}

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

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===========================
   Header
   =========================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: transparent;
    border-bottom: none;
    padding: 1rem 0;
    z-index: 100;
}

[data-theme="dark"] .header {
    background: transparent;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
    margin-right: 0.5rem;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    border-radius: 2px;
    transition: var(--transition);
}

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

.nav-item {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
    color: var(--primary-color);
}

.nav-item:hover {
    background: var(--background-alt);
}

.nav-item-login {
    color: var(--primary-color);
}

.nav-item-cta {
    background: var(--primary-color);
    color: white !important;
}

.nav-item-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    background-image: url('/hero.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: white;
    padding: 6rem 2rem 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.5) 100%);
    z-index: 0;
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    width: 100%;
    padding: 0 2rem;
}

.hero-content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    animation: fadeInUp 0.8s ease-out;
    position: relative;
    z-index: 2;
}

.hero-content {
    text-align: left;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    line-height: 1.2;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5), 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Benefits */
.benefits {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.benefit {
    font-size: 1.15rem;
    line-height: 1.6;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.benefit a {
    color: white;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-thickness: 2px;
    transition: var(--transition);
}

.benefit a:hover {
    text-decoration-thickness: 3px;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

/* Signup Card */
.hero-signup-card {
    background: white;
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    position: relative;
    max-width: 480px;
    margin-left: auto;
}

.signup-bubble {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
    white-space: nowrap;
}

.signup-bubble::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid #059669;
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.signup-input {
    padding: 1rem 1.25rem;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition);
    width: 100%;
    font-family: inherit;
}

.signup-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    font-family: inherit;
}

.btn-cta {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 50%, #f06595 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.btn-google {
    background: white;
    color: #1f2937;
    border: 2px solid #e5e7eb;
}

.btn-google:hover {
    background: #f9fafb;
    border-color: #d1d5db;
}

.signup-hint {
    text-align: center;
    font-size: 0.85rem;
    color: #6b7280;
    margin-top: 0.5rem;
}

/* ===========================
   Features Preview Section
   =========================== */
.features-preview {
    padding: 5rem 2rem;
    background: var(--background-alt);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--background);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ===========================
   Flash Messages
   =========================== */
.flash-messages {
    max-width: 1200px;
    margin: 1rem auto;
    padding: 0 2rem;
}

.flash-message {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    animation: slideIn 0.3s ease-out;
}

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

.flash-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.flash-message.warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.flash-message.info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--background-alt);
    padding: 3rem 2rem 1rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-light);
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 968px) {
    .hero-content-wrapper {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-signup-card {
        margin: 0 auto;
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        display: none;
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-item {
        width: 100%;
        text-align: center;
    }
    
    .hero {
        min-height: 500px;
        padding: 5rem 1.5rem 3rem;
    }
    
    .hero-container {
        padding: 0 1rem;
    }
    
    .hero-content-wrapper {
        gap: 2.5rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .benefit {
        font-size: 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .signup-bubble {
        font-size: 0.85rem;
        padding: 0.6rem 1.2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: 450px;
        padding: 5.5rem 1rem 2.5rem;
    }
    
    .hero-container {
        padding: 0 0.75rem;
    }
    
    .hero-content-wrapper {
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .benefit {
        font-size: 0.95rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-signup-card {
        padding: 2rem 1.5rem;
    }
    
    .signup-bubble {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
}