:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --glass-blur: 16px;
    
    /* Semantic aliases for consistent internal use */
    --bg-card: var(--card-bg);
    --border: var(--border-color);
    --text-primary: var(--text-main);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-image: 
        radial-gradient(at 0% 0%, hsla(253, 16%, 7%, 1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(225, 39%, 30%, 1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(339, 49%, 30%, 1) 0, transparent 50%);
    overflow-x: hidden;
}

.container {
    width: 90%;
    max-width: 600px;
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
    animation: fadeIn 0.8s ease-out;
}

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

h1 {
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

p.subtitle {
    color: var(--text-dim);
    margin-bottom: 2.5rem;
    font-size: clamp(0.9rem, 3vw, 1.1rem);
}

.input-box {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: 18px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.input-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

input {
    flex: 1;
    background: transparent;
    border: none;
    color: #fff;
    padding: 0.8rem 1.2rem;
    font-size: 1rem;
    outline: none;
}

button#shortenBtn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.8rem 1.8rem;
    border-radius: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

button#shortenBtn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.result-container {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 18px;
    border: 1px dashed var(--border-color);
    display: none;
}

.result-container.active {
    display: block;
    animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

#shortLink {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.2rem;
    word-wrap: break-word;
}

.copy-button {
    width: 100%;
    padding: 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--primary);
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}

.copy-button:hover {
    background: var(--primary);
    color: white;
}

/* General Components */
.primary-button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 14px;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    margin-top: 1rem;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.primary-button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.countdown {
    font-size: 5rem;
    font-weight: 900;
    color: var(--primary);
    margin: 2rem 0;
    text-shadow: 0 0 30px rgba(99, 102, 241, 0.4);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255,255,255,0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto 2rem;
    animation: spin 1s linear infinite;
}

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

.step-content h1 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

/* Responsive Container & Spacing */
@media (max-width: 600px) {
    .container {
        padding: 1.5rem;
        width: 95%;
        border-radius: 20px;
    }
    
    .input-box {
        flex-direction: column;
        background: transparent;
        border: none;
        padding: 0;
        gap: 1rem;
    }
    
    .input-box input {
        background: rgba(0, 0, 0, 0.2);
        border: 1px solid var(--border-color);
        border-radius: 14px;
        width: 100%;
        padding: 1rem;
    }
    
    #shortenBtn {
        width: 100%;
        padding: 1.2rem !important;
    }

    .countdown {
        font-size: 3.5rem;
    }

    .step-content h1 {
        font-size: 1.8rem;
    }
}

/* Admin Dashboard Responsiveness */
.admin-page {
    display: block;
    padding: 1rem;
    width: 100%;
}

.admin-page .container {
    margin: 0 auto;
    text-align: left;
    max-width: 1000px;
    width: 100%;
}

@media (max-width: 768px) {
    .admin-nav {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    td, th {
        padding: 0.75rem 0.5rem;
        font-size: 0.85rem;
    }
}