/* ============================================
   CSS Variables & Base Styles
   ============================================ */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);
    
    --accent-primary: #7c3aed;
    --accent-secondary: #a855f7;
    --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #a855f7 50%, #c084fc 100%);
    
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(124, 58, 237, 0.5);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Background Effects
   ============================================ */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.4) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.3) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(192, 132, 252, 0.25) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 30px) scale(1.02); }
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
    display: none !important;
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ============================================
   Loader Animation
   ============================================ */
.loader {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Redirect & Not Found Overlays
   ============================================ */
.redirect-overlay,
.not-found-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.redirect-content,
.not-found-content {
    text-align: center;
}

.redirect-content p {
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.not-found-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    filter: grayscale(0.5);
}

.not-found-content h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.not-found-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* ============================================
   App Container
   ============================================ */
.app {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Header
   ============================================ */
.header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

/* ============================================
   Main Content
   ============================================ */
.main {
    flex: 1;
    padding: 2rem;
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto;
}

/* ============================================
   Create Section
   ============================================ */
.create-section {
    padding: 2rem;
    margin-bottom: 2rem;
}

.create-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.create-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input {
    padding: 0.875rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.slug-input-wrapper {
    display: flex;
    align-items: stretch;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.slug-input-wrapper:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.slug-prefix {
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-muted);
    font-size: 0.875rem;
    border-right: 1px solid var(--border-color);
    white-space: nowrap;
}

.slug-input-wrapper input {
    flex: 1;
    border: none;
    background: transparent;
    border-radius: 0;
}

.slug-input-wrapper input:focus {
    box-shadow: none;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-sm), 0 0 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 30px rgba(124, 58, 237, 0.4);
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-create {
    width: 100%;
    padding: 1rem;
    margin-top: 0.5rem;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem;
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.btn-copy {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
}

.btn-copy:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-copy.copied {
    background: var(--success);
}

.refresh-icon {
    font-size: 1.25rem;
    display: inline-block;
    transition: transform var(--transition-normal);
}

.btn-ghost:hover .refresh-icon {
    transform: rotate(180deg);
}

/* ============================================
   Success & Error Messages
   ============================================ */
.success-message {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-md);
    text-align: center;
    animation: slideIn var(--transition-normal) ease;
}

.success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--success);
    border-radius: 50%;
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.success-message p {
    color: var(--success);
    font-weight: 500;
    margin-bottom: 1rem;
}

.created-link-display {
    display: flex;
    gap: 0.5rem;
}

.created-link-display input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
}

.error-message {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: shake 0.4s ease;
}

.error-message span {
    color: var(--error);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* ============================================
   Links Section
   ============================================ */
.links-section {
    padding: 2rem;
}

.links-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.links-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

.links-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    color: var(--text-secondary);
}

.no-links {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.link-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.link-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.12);
}

.link-info {
    flex: 1;
    min-width: 0;
}

.link-short {
    font-weight: 600;
    color: var(--accent-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.link-destination {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.link-stats {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.link-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-icon.btn-delete:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--error);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 640px) {
    .main {
        padding: 1.5rem;
    }
    
    .create-section,
    .links-section {
        padding: 1.5rem;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .slug-prefix {
        font-size: 0.75rem;
        padding: 0 0.5rem;
    }
    
    .created-link-display {
        flex-direction: column;
    }
    
    .link-item {
        flex-wrap: wrap;
    }
    
    .link-stats {
        width: 100%;
        margin-top: 0.5rem;
    }
}