:root {
    --primary: #000000;
    --bg-dark: #111111;
    --bg-card: #1a1a1a;
    --gray: #2e2e2e;
    --light-gray: #a0a0a0;
    --white: #ffffff;
    --accent: #ffffff;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

button, .btn {
    cursor: pointer;
    border: none;
    outline: none;
    transition: var(--transition);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover {
    background-color: #e0e0e0;
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background-color: var(--white);
    color: var(--primary);
}

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

section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    font-weight: 800;
}

/* Navbar */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
    background: rgba(17, 17, 17, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a:hover {
    opacity: 0.7;
}

/* Glass Cards */
.glass-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px;
    padding: 2rem;
    transition: var(--transition);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.06);
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 2rem;
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--white);
    border: 1px solid var(--glass-border);
    z-index: 2000;
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-error { border-color: #ff4444; }
.toast-success { border-color: #00C851; }

/* Responsive */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    padding: 0.5rem;
    z-index: 1002;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 30px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
    display: block;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 80%;
        background: rgba(17, 17, 17, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.5s cubic-bezier(0.77, 0, 0.175, 1);
        border-left: 1px solid var(--glass-border);
        box-shadow: -10px 0 30px rgba(0,0,0,0.5);
        z-index: 1001;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .nav-links a {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-card) 25%, var(--gray) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.loader {
    width: 18px;
    height: 18px;
    border: 2px solid var(--primary);
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    animation: rotation 1s linear infinite;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--light-gray);
}

input, textarea, select {
    width: 100%;
    padding: 0.8rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--white);
    outline: none;
    transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
    border-color: var(--white);
}

/* Password Strength Meter */
.strength-meter {
    height: 4px;
    background: var(--gray);
    margin-top: 0.5rem;
    border-radius: 2px;
    overflow: hidden;
}

.strength-meter-fill {
    height: 100%;
    width: 0;
    transition: var(--transition);
}

.strength-weak { background: #ff4444; width: 33%; }
.strength-medium { background: #ffbb33; width: 66%; }
.strength-strong { background: #00C851; width: 100%; }

.requirements {
    font-size: 0.8rem;
    margin-top: 0.5rem;
    list-style: none;
}

.requirement.met { color: #00C851; }
.requirement.unmet { color: #ff4444; }