@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Futuristic Deep Dark Theme */
    --bg: #0b0d12;
    --panel: #131722;
    --accent: #5865f2;
    --accent-rgb: 88, 101, 242;
    --accent-hover: #4752c4;
    --accent-gradient: linear-gradient(135deg, #5865f2 0%, #8b5cf6 100%);
    --text: #f3f4f6;
    --text-dim: #9ca3af;
    --glass: rgba(19, 23, 34, 0.65);
    --border: rgba(255, 255, 255, 0.07);
    --card-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
    --input-bg: #1c2030;
    --switch-bg: #2d334a;
    --radius: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='light'] {
    /* Sleek Clean Light Theme */
    --bg: #f3f4f6;
    --panel: #ffffff;
    --accent: #4f46e5;
    --accent-rgb: 79, 70, 229;
    --accent-hover: #4338ca;
    --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --text: #111827;
    --text-dim: #6b7280;
    --glass: rgba(255, 255, 255, 0.75);
    --border: rgba(0, 0, 0, 0.08);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    --input-bg: #f9fafb;
    --switch-bg: #e5e7eb;
}

* {
    margin: 0; padding: 0;
    box-sizing: border-box;
    font-family: 'Pretendard', 'Outfit', sans-serif;
}

[data-font='NanumGothic'] * {
    font-family: 'Nanum Gothic', sans-serif;
}

body {
    background: var(--bg);
    color: var(--text);
    display: flex;
    height: 100vh;
    overflow: hidden;
    transition: background 0.5s ease;
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
}

/* Stunning Animated Gradient Background */
.glass-bg {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(var(--accent-rgb), 0.12) 0%, transparent 45%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.12) 0%, transparent 45%);
    filter: blur(30px);
    z-index: -1;
    pointer-events: none;
}

[data-theme='light'] .glass-bg {
    background: 
        radial-gradient(circle at 10% 20%, rgba(var(--accent-rgb), 0.06) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(124, 58, 237, 0.06) 0%, transparent 40%);
}

/* Sidebar Styling */
.sidebar {
    width: 280px;
    background: var(--panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 2.5rem 1.25rem;
    z-index: 10;
    transition: var(--transition);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 2.5rem;
    padding-left: 0.8rem;
    letter-spacing: -0.5px;
}

.logo i {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 8px rgba(var(--accent-rgb), 0.4));
}

.nav-links {
    list-style: none;
    flex-grow: 1;
}

.nav-links li {
    padding: 0.9rem 1.25rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--text-dim);
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.nav-links li:hover {
    background: rgba(var(--accent-rgb), 0.08);
    color: var(--text);
    transform: translateX(4px);
}

.nav-links li.active {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(var(--accent-rgb), 0.35);
}

.nav-links li i {
    font-size: 1.15rem;
    width: 22px;
    text-align: center;
}

/* Content Area */
.content {
    flex: 1;
    padding: 2.5rem 3.5rem;
    overflow-y: auto;
    position: relative;
    scroll-behavior: smooth;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    gap: 20px;
}

header h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.8px;
    background: linear-gradient(to right, var(--text) 50%, var(--text-dim));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
    padding: 0.5rem;
    z-index: 20;
    transition: var(--transition);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(6px);
    z-index: 9;
}

/* Modern Card with Glassmorphism */
.card {
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius); 
    padding: 2.2rem;
    margin-bottom: 1.8rem;
    border: 1px solid var(--border);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    animation: fadeIn 0.4s ease-out;
}

.card:hover {
    border-color: rgba(var(--accent-rgb), 0.25);
    transform: translateY(-3px);
    box-shadow: 0 16px 45px 0 rgba(0, 0, 0, 0.45);
}

[data-theme='light'] .card:hover {
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.06);
}

.card h2, .card h3 {
    margin-bottom: 1.2rem;
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.4px;
}

/* Settings Row layout */
.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
    border-bottom: 1px solid var(--border);
    gap: 20px;
}

.setting-row:last-child {
    border-bottom: none;
}

.setting-row span {
    color: var(--text);
    font-weight: 600;
    font-size: 1rem;
}

/* Inputs, Numbers, Selects */
input[type="text"], input[type="password"], input[type="number"], select {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    outline: none;
    transition: var(--transition);
    width: 260px;
    font-weight: 550;
    font-size: 0.92rem;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.25);
    background: var(--panel);
}

textarea {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    outline: none;
    transition: var(--transition);
    font-weight: 550;
    font-size: 0.92rem;
    font-family: inherit;
    line-height: 1.5;
    resize: vertical;
    min-height: 96px;
}

code {
    background: rgba(var(--accent-rgb), 0.12);
    color: var(--accent);
    padding: 0.15rem 0.45rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.verification-quick-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 1.5rem;
    padding: 0.85rem 1rem;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 14px;
}

.verification-quick-nav a {
    color: var(--text);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel);
    transition: var(--transition);
}

.verification-quick-nav a:hover {
    border-color: var(--accent);
    color: var(--accent);
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* Responsive Grid and Flex */
.responsive-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.responsive-flex {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .responsive-grid {
        grid-template-columns: 1fr;
    }
    .responsive-flex {
        flex-direction: column;
        align-items: stretch;
    }
    input[type="text"], input[type="password"], input[type="number"], select {
        width: 100% !important;
    }
}

/* Select Styling */
select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.1rem;
    padding-right: 2.8rem;
    appearance: none;
}

[data-theme='light'] select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%234b5563' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

select option {
    background: var(--panel);
    color: var(--text);
    padding: 12px;
}

/* Switches */
.switch {
    width: 48px;
    height: 25px;
    background: var(--switch-bg);
    border-radius: 100px;
    position: relative;
    cursor: pointer;
    transition: var(--transition);
}

.switch::after {
    content: '';
    position: absolute;
    width: 19px;
    height: 19px;
    border-radius: 50%;
    background: #ffffff;
    top: 3px;
    left: 3px;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.switch.on {
    background: var(--accent);
}

.switch.on::after {
    left: 26px;
}

/* Buttons */
.save-btn {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    padding: 0.85rem 1.6rem;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.3);
    font-size: 0.95rem;
}

.save-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.45);
    opacity: 0.95;
}

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

/* Tables styling */
table {
    width: 100%;
    border-spacing: 0 8px;
    border-collapse: separate;
}

table th {
    color: var(--text-dim);
    text-align: left;
    padding: 0.8rem 1.2rem;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

table tr td {
    background: rgba(255, 255, 255, 0.02);
    padding: 1.1rem 1.2rem;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

table tr:hover td {
    background: rgba(var(--accent-rgb), 0.04);
}

table tr td:first-child { 
    border-radius: 12px 0 0 12px; 
    border-left: 1px solid var(--border);
}
table tr td:last-child { 
    border-radius: 0 12px 12px 0; 
    border-right: 1px solid var(--border);
}

[data-theme='light'] table tr td {
    background: rgba(0, 0, 0, 0.01);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* Animation keyframes */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Responsive Adjustments */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0; top: 0; bottom: 0;
        width: 270px;
        transform: translateX(-100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 100;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: 10px 0 30px rgba(0,0,0,0.5);
    }

    .sidebar-overlay.visible {
        display: block;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .content {
        padding: 1.5rem;
    }

    header {
        margin-bottom: 1.8rem;
    }

    header h1 {
        font-size: 1.6rem;
    }

    .user-info {
        gap: 8px !important;
    }

    .user-info span {
        display: none;
    }

    .card {
        padding: 1.5rem;
        border-radius: 16px;
    }

    .setting-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .setting-row span {
        width: 100%;
    }

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

    footer {
        justify-content: center !important;
    }
    
    table {
        display: block;
        overflow-x: auto;
    }
}