/* ========================================
   MODERN API PLATFORM STYLESHEET
   ======================================== */

/* RESET & BASE */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    /* Neutrals */
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f1f5f9;
    --white: #ffffff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-dark: linear-gradient(135deg, #1e3a8a 0%, #312e81 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --shadow-xl: 0 12px 48px rgba(0,0,0,0.2);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* BODY & HTML */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background Particles */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* CONTAINER */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    position: relative;
    z-index: 1;
}

/* NAVBAR */
.navbar {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.navbar-brand a {
    color: var(--white);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-menu {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.navbar a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.navbar a:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.navbar a.active {
    background: var(--gradient-primary);
    color: var(--white);
}

/* Hamburger Menu untuk Mobile */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: var(--space-xs);
}

.navbar-toggle span {
    width: 24px;
    height: 3px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}

/* CARD */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    margin: var(--space-xl) auto;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 500px;
    animation: fadeInUp 0.6s ease-out;
    position: relative;
    overflow: hidden;
}

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

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.card h1, .card h2 {
    color: var(--dark);
    margin-bottom: var(--space-md);
    font-weight: 700;
}

.card h1 {
    font-size: 2.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card h2 {
    font-size: 2rem;
}

.card h4 {
    font-size: 1.2rem;
    color: var(--gray);
    margin: var(--space-lg) 0 var(--space-sm) 0;
    font-weight: 600;
}

.card p {
    color: var(--gray);
    margin-bottom: var(--space-lg);
    font-size: 1.1rem;
}

/* FORM */
.form-group {
    margin-bottom: var(--space-md);
    position: relative;
}

.form-label {
    display: block;
    color: var(--dark);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    font-size: 0.9rem;
}

form input {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.9);
    font-family: inherit;
}

form input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

form input::placeholder {
    color: var(--gray-light);
}

form input.error {
    border-color: var(--danger);
}

form input.success {
    border-color: var(--success);
}

/* BUTTON */
form button,
.btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    background: var(--gradient-primary);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-md);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

form button::before,
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

form button:hover::before,
.btn:hover::before {
    left: 100%;
}

form button:hover,
.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

form button:active,
.btn:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gradient-secondary);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

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

.btn-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-lg);
}

/* API KEY DISPLAY */
pre {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: #38bdf8;
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.8;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(56, 189, 248, 0.2);
    position: relative;
}

pre::before {
    content: '🔑 API KEY';
    position: absolute;
    top: -12px;
    left: 20px;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
}

.copy-btn {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(56, 189, 248, 0.2);
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: #38bdf8;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
}

.copy-btn:hover {
    background: rgba(56, 189, 248, 0.3);
}

/* UTILITIES */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }

/* ALERT */
.alert {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    border-left: 4px solid;
    animation: slideInRight 0.3s ease-out;
}

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

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success);
    color: #065f46;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger);
    color: #991b1b;
}

.alert-info {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary);
    color: #3730a3;
}

/* FOOTER */
.footer {
    text-align: center;
    padding: var(--space-xl) 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    margin-top: var(--space-xl);
    position: relative;
    z-index: 1;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* LOADING SPINNER */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* FEATURE CARDS */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.9);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    color: var(--dark);
    margin-bottom: var(--space-sm);
}

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

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    :root {
        --space-xs: 0.4rem;
        --space-sm: 0.8rem;
        --space-md: 1.2rem;
        --space-lg: 1.6rem;
        --space-xl: 2rem;
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .navbar-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-md);
        gap: var(--space-xs);
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }
    
    .navbar-menu.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .navbar a {
        width: 100%;
        padding: var(--space-md);
    }
    
    .card {
        padding: var(--space-lg);
        margin: var(--space-md) auto;
    }
    
    .card h1 {
        font-size: 2rem;
    }
    
    .card h2 {
        font-size: 1.5rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
        text-align: center;
    }
    
    pre {
        font-size: 0.85rem;
        padding: var(--space-md);
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .card h1 {
        font-size: 1.75rem;
    }
    
    .navbar-brand a {
        font-size: 1.25rem;
    }
}

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

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* DARK MODE SUPPORT (Optional) */
@media (prefers-color-scheme: dark) {
    .card {
        background: rgba(30, 41, 59, 0.95);
        color: var(--white);
    }
    
    .card h1, .card h2, .card h3 {
        color: var(--white);
    }
    
    form input {
        background: rgba(15, 23, 42, 0.5);
        color: var(--white);
        border-color: rgba(255, 255, 255, 0.2);
    }
    
    form input::placeholder {
        color: rgba(255, 255, 255, 0.4);
    }
}

/* SCROLL BAR STYLING */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}