/* ==========================================
   Variables & Reset
   ========================================== */

:root {
    --color-navy: #0a192f;
    --color-navy-light: #112240;
    --color-turquoise: #00bfa6;
    --color-turquoise-light: #1dd1b8;
    --color-white: #ffffff;
    --color-gray-light: #8892b0;
    --color-gray-lighter: #ccd6f6;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-navy);
    color: var(--color-gray-lighter);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   Background Effects
   ========================================== */

.container {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}

.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        var(--color-navy) 0%,
        var(--color-navy-light) 50%,
        var(--color-navy) 100%
    );
    z-index: 1;
}

.bg-pattern {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    opacity: 0.03;
    z-index: 2;
    background-image:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            var(--color-turquoise) 2px,
            var(--color-turquoise) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            var(--color-turquoise) 2px,
            var(--color-turquoise) 4px
        );
    background-size: 80px 80px;
    animation: patternMove 20s linear infinite;
}

@keyframes patternMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(80px, 80px);
    }
}

/* Animated particles effect */
.bg-gradient::before,
.bg-gradient::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 15s ease-in-out infinite;
}

.bg-gradient::before {
    width: 500px;
    height: 500px;
    background: var(--color-turquoise);
    top: -250px;
    right: -250px;
}

.bg-gradient::after {
    width: 400px;
    height: 400px;
    background: var(--color-turquoise-light);
    bottom: -200px;
    left: -200px;
    animation-delay: 7s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* ==========================================
   Main Content
   ========================================== */

.content {
    position: relative;
    z-index: 10;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* ==========================================
   Logo & Brand
   ========================================== */

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 1s ease-out;
}

.logo-icon {
    width: 60px;
    height: 60px;
    color: var(--color-turquoise);
    filter: drop-shadow(0 0 20px rgba(0, 191, 166, 0.3));
}

.brand-name {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--color-white);
    letter-spacing: 0.05em;
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
    text-align: center;
    max-width: 800px;
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 1s ease-out 0.3s backwards;
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 191, 166, 0.1);
    border: 1px solid var(--color-turquoise);
    color: var(--color-turquoise);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(0, 191, 166, 0.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(0, 191, 166, 0);
    }
}

.headline {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-turquoise) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subheadline {
    font-size: 1.125rem;
    color: var(--color-gray-light);
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   Features Grid
   ========================================== */

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    width: 100%;
    max-width: 1000px;
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 1s ease-out 0.6s backwards;
}

.feature-card {
    background: rgba(17, 34, 64, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 191, 166, 0.1);
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 191, 166, 0.05) 100%);
    opacity: 0;
    transition: var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-turquoise);
    box-shadow: 0 10px 40px rgba(0, 191, 166, 0.2);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-turquoise);
    position: relative;
    z-index: 1;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
    position: relative;
    z-index: 1;
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-light);
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* ==========================================
   Signup Section
   ========================================== */

.signup {
    text-align: center;
    max-width: 600px;
    width: 100%;
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 1s ease-out 0.9s backwards;
}

.signup-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.signup-subtitle {
    font-size: 0.9375rem;
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-md);
}

.signup-form {
    width: 100%;
}

.input-group {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
}

.input-group input[type="email"] {
    flex: 1;
    padding: 1rem 1.5rem;
    background: rgba(17, 34, 64, 0.8);
    border: 2px solid rgba(0, 191, 166, 0.2);
    border-radius: 12px;
    color: var(--color-white);
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: var(--transition-smooth);
    outline: none;
}

.input-group input[type="email"]::placeholder {
    color: var(--color-gray-light);
}

.input-group input[type="email"]:focus {
    border-color: var(--color-turquoise);
    box-shadow: 0 0 0 4px rgba(0, 191, 166, 0.1);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--color-turquoise) 0%, var(--color-turquoise-light) 100%);
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(0, 191, 166, 0.3);
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 191, 166, 0.4);
}

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

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ==========================================
   Footer
   ========================================== */

.footer {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(0, 191, 166, 0.1);
    animation: fadeIn 1s ease-out 1.2s backwards;
}

.footer p {
    font-size: 0.875rem;
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-xs);
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-gray-light);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition-smooth);
}

.footer-links a:hover {
    color: var(--color-turquoise);
}

.footer-links .separator {
    color: var(--color-gray-light);
    opacity: 0.5;
}

/* ==========================================
   Animations
   ========================================== */

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

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

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
    .content {
        padding: var(--spacing-sm);
    }

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

    .logo-icon {
        width: 45px;
        height: 45px;
    }

    .brand-name {
        font-size: 1.75rem;
    }

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

    .headline {
        font-size: 2rem;
        margin-bottom: var(--spacing-sm);
    }

    .subheadline {
        font-size: 1rem;
    }

    .features {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .input-group {
        flex-direction: column;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2.5rem;
    }

    .brand-name {
        font-size: 1.5rem;
    }

    .headline {
        font-size: 1.75rem;
    }

    .feature-card {
        padding: var(--spacing-sm);
    }
}

/* ==========================================
   Accessibility
   ========================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-turquoise);
    outline-offset: 2px;
}