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

:root,
:root[data-theme="classic"] {
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-navbar: #2d3748;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-light: #f7fafc;
    --accent-purple: #9f7aea;
    --accent-purple-light: #e9d8fd;
    --accent-teal: #38b2ac;
    --accent-teal-light: #b2f5ea;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --body-gradient:
        radial-gradient(circle at top left, rgba(159, 122, 234, 0.14), transparent 36%),
        radial-gradient(circle at top right, rgba(56, 178, 172, 0.12), transparent 34%);
    --navbar-hover-bg: rgba(255, 255, 255, 0.1);
    --menu-hover-bg: linear-gradient(135deg, var(--accent-purple-light), var(--accent-teal-light));
    --nav-border-color: rgba(255, 255, 255, 0.08);
    --footer-border-color: rgba(255, 255, 255, 0.1);
    --container-border-color: rgba(255, 255, 255, 0.75);
    --button-shadow: rgba(159, 122, 234, 0.3);
    --button-shadow-hover: rgba(159, 122, 234, 0.4);
    --theme-toggle-bg: rgba(255, 255, 255, 0.08);
    --theme-toggle-bg-hover: rgba(255, 255, 255, 0.14);
    --theme-toggle-border: rgba(255, 255, 255, 0.16);
    --theme-toggle-text: var(--text-light);
    --footer-background: var(--bg-navbar);
}

/* Future themes only need to override this shared token set. */
:root[data-theme="workshop"] {
    --font-body: 'Avenir Next', 'Segoe UI', sans-serif;
    --bg-primary: #efe6d8;
    --bg-secondary: #fffaf1;
    --bg-navbar: #23443f;
    --text-primary: #30251f;
    --text-secondary: #6e5e51;
    --text-light: #f9f2e8;
    --accent-purple: #c56a43;
    --accent-purple-light: #f2d4c4;
    --accent-teal: #5f7d5b;
    --accent-teal-light: #dbe6d1;
    --border-color: #d9c7b3;
    --shadow-sm: 0 1px 3px rgba(48, 37, 31, 0.08);
    --shadow-md: 0 10px 24px rgba(48, 37, 31, 0.12);
    --shadow-lg: 0 20px 40px rgba(48, 37, 31, 0.16);
    --body-gradient:
        radial-gradient(circle at top left, rgba(197, 106, 67, 0.2), transparent 35%),
        radial-gradient(circle at top right, rgba(95, 125, 91, 0.18), transparent 38%),
        linear-gradient(180deg, #f7efdf 0%, #efe6d8 100%);
    --navbar-hover-bg: rgba(255, 250, 241, 0.12);
    --menu-hover-bg: linear-gradient(135deg, #efd0be, #dfe7d4);
    --nav-border-color: rgba(255, 250, 241, 0.14);
    --footer-border-color: rgba(255, 250, 241, 0.14);
    --container-border-color: rgba(48, 37, 31, 0.06);
    --button-shadow: rgba(197, 106, 67, 0.28);
    --button-shadow-hover: rgba(197, 106, 67, 0.38);
    --theme-toggle-bg: rgba(255, 250, 241, 0.08);
    --theme-toggle-bg-hover: rgba(255, 250, 241, 0.14);
    --theme-toggle-border: rgba(255, 250, 241, 0.18);
    --theme-toggle-text: var(--text-light);
    --footer-background: linear-gradient(180deg, #28504a 0%, #1f3d38 100%);
}

:root[data-theme="midnight"] {
    --font-body: 'Inter', sans-serif;
    --bg-primary: #101418;
    --bg-secondary: #182028;
    --bg-navbar: #0d1117;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-light: #f9fafb;
    --accent-purple: #7c3aed;
    --accent-purple-light: #ddd6fe;
    --accent-teal: #14b8a6;
    --accent-teal-light: #99f6e4;
    --border-color: #27303b;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.22);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.28);
    --body-gradient: linear-gradient(180deg, #111827 0%, #0f172a 100%);
    --navbar-hover-bg: rgba(255, 255, 255, 0.08);
    --menu-hover-bg: linear-gradient(135deg, #312e81, #134e4a);
    --nav-border-color: rgba(255, 255, 255, 0.08);
    --footer-border-color: rgba(255, 255, 255, 0.08);
    --container-border-color: rgba(255, 255, 255, 0.06);
    --button-shadow: rgba(124, 58, 237, 0.28);
    --button-shadow-hover: rgba(124, 58, 237, 0.38);
    --theme-toggle-bg: rgba(255, 255, 255, 0.08);
    --theme-toggle-bg-hover: rgba(255, 255, 255, 0.14);
    --theme-toggle-border: rgba(255, 255, 255, 0.16);
    --theme-toggle-text: var(--text-light);
    --footer-background: #0d1117;
}

:root[data-theme="midnight"] .navbar-brand {
    letter-spacing: 0.06em;
}

:root[data-theme="slate"] {
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --bg-primary: #f4f6f8;
    --bg-secondary: #ffffff;
    --bg-navbar: #1e2a3a;
    --text-primary: #1a202c;
    --text-secondary: #64748b;
    --text-light: #f1f5f9;
    --accent-purple: #3b82f6;
    --accent-purple-light: #dbeafe;
    --accent-teal: #0ea5e9;
    --accent-teal-light: #e0f2fe;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.07);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.09);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.11);
    --body-gradient:
        radial-gradient(circle at top left, rgba(59, 130, 246, 0.1), transparent 36%),
        radial-gradient(circle at top right, rgba(14, 165, 233, 0.08), transparent 34%);
    --navbar-hover-bg: rgba(255, 255, 255, 0.1);
    --menu-hover-bg: linear-gradient(135deg, #dbeafe, #e0f2fe);
    --nav-border-color: rgba(255, 255, 255, 0.08);
    --footer-border-color: rgba(255, 255, 255, 0.1);
    --container-border-color: rgba(255, 255, 255, 0.75);
    --button-shadow: rgba(59, 130, 246, 0.28);
    --button-shadow-hover: rgba(59, 130, 246, 0.38);
    --theme-toggle-bg: rgba(255, 255, 255, 0.08);
    --theme-toggle-bg-hover: rgba(255, 255, 255, 0.14);
    --theme-toggle-border: rgba(255, 255, 255, 0.16);
    --theme-toggle-text: var(--text-light);
    --footer-background: #1e2a3a;
}

:root[data-theme="amber"] {
    --font-body: 'Georgia', 'Times New Roman', serif;
    --bg-primary: #fdf8f0;
    --bg-secondary: #fffcf5;
    --bg-navbar: #3b2a1a;
    --text-primary: #2c1a0e;
    --text-secondary: #7c6a57;
    --text-light: #fdf8f0;
    --accent-purple: #d97706;
    --accent-purple-light: #fde68a;
    --accent-teal: #b45309;
    --accent-teal-light: #fef3c7;
    --border-color: #e7d9c4;
    --shadow-sm: 0 1px 3px rgba(44, 26, 14, 0.08);
    --shadow-md: 0 4px 12px rgba(44, 26, 14, 0.1);
    --shadow-lg: 0 10px 30px rgba(44, 26, 14, 0.13);
    --body-gradient:
        radial-gradient(circle at top left, rgba(217, 119, 6, 0.16), transparent 36%),
        radial-gradient(circle at top right, rgba(180, 83, 9, 0.12), transparent 34%),
        linear-gradient(180deg, #fffcf5 0%, #fdf8f0 100%);
    --navbar-hover-bg: rgba(253, 248, 240, 0.12);
    --menu-hover-bg: linear-gradient(135deg, #fde68a, #fef3c7);
    --nav-border-color: rgba(253, 248, 240, 0.14);
    --footer-border-color: rgba(253, 248, 240, 0.14);
    --container-border-color: rgba(44, 26, 14, 0.06);
    --button-shadow: rgba(217, 119, 6, 0.28);
    --button-shadow-hover: rgba(217, 119, 6, 0.4);
    --theme-toggle-bg: rgba(253, 248, 240, 0.08);
    --theme-toggle-bg-hover: rgba(253, 248, 240, 0.14);
    --theme-toggle-border: rgba(253, 248, 240, 0.18);
    --theme-toggle-text: var(--text-light);
    --footer-background: #3b2a1a;
}

:root[data-theme="amber"] .navbar-brand {
    letter-spacing: 0.04em;
}

:root[data-theme="terminal"] {
    --font-body: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    --bg-primary: #0a0e0a;
    --bg-secondary: #0d120d;
    --bg-navbar: #050805;
    --text-primary: #22c55e;
    --text-secondary: #4ade80;
    --text-light: #86efac;
    --accent-purple: #16a34a;
    --accent-purple-light: #bbf7d0;
    --accent-teal: #22c55e;
    --accent-teal-light: #86efac;
    --border-color: #14532d;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6);
    --body-gradient:
        radial-gradient(circle at top left, rgba(34, 197, 94, 0.08), transparent 40%),
        linear-gradient(180deg, #0a0e0a 0%, #080c08 100%);
    --navbar-hover-bg: rgba(34, 197, 94, 0.08);
    --menu-hover-bg: linear-gradient(135deg, #052e16, #14532d);
    --nav-border-color: rgba(34, 197, 94, 0.12);
    --footer-border-color: rgba(34, 197, 94, 0.12);
    --container-border-color: rgba(34, 197, 94, 0.1);
    --button-shadow: rgba(22, 163, 74, 0.3);
    --button-shadow-hover: rgba(22, 163, 74, 0.45);
    --theme-toggle-bg: rgba(34, 197, 94, 0.06);
    --theme-toggle-bg-hover: rgba(34, 197, 94, 0.12);
    --theme-toggle-border: rgba(34, 197, 94, 0.2);
    --theme-toggle-text: var(--text-light);
    --footer-background: #050805;
}

:root[data-theme="terminal"] .navbar-brand {
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

:root[data-theme="terminal"] .container {
    border-radius: 4px;
    border-color: rgba(34, 197, 94, 0.2);
}

:root[data-theme="rose"] {
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --bg-primary: #fdf2f2;
    --bg-secondary: #fff8f8;
    --bg-navbar: #7f1d1d;
    --text-primary: #2d1515;
    --text-secondary: #9f7070;
    --text-light: #fdf2f2;
    --accent-purple: #e11d48;
    --accent-purple-light: #ffe4e6;
    --accent-teal: #be123c;
    --accent-teal-light: #fecdd3;
    --border-color: #fbc7c7;
    --shadow-sm: 0 1px 3px rgba(45, 21, 21, 0.08);
    --shadow-md: 0 4px 12px rgba(45, 21, 21, 0.1);
    --shadow-lg: 0 10px 30px rgba(45, 21, 21, 0.13);
    --body-gradient:
        radial-gradient(circle at top left, rgba(225, 29, 72, 0.12), transparent 36%),
        radial-gradient(circle at top right, rgba(190, 18, 60, 0.08), transparent 34%);
    --navbar-hover-bg: rgba(253, 242, 242, 0.12);
    --menu-hover-bg: linear-gradient(135deg, #ffe4e6, #fecdd3);
    --nav-border-color: rgba(253, 242, 242, 0.14);
    --footer-border-color: rgba(253, 242, 242, 0.14);
    --container-border-color: rgba(45, 21, 21, 0.06);
    --button-shadow: rgba(225, 29, 72, 0.28);
    --button-shadow-hover: rgba(225, 29, 72, 0.4);
    --theme-toggle-bg: rgba(253, 242, 242, 0.08);
    --theme-toggle-bg-hover: rgba(253, 242, 242, 0.14);
    --theme-toggle-border: rgba(253, 242, 242, 0.18);
    --theme-toggle-text: var(--text-light);
    --footer-background: #7f1d1d;
}

body {
    font-family: var(--font-body);
    min-height: 100vh;
    background: var(--body-gradient), var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background: var(--bg-navbar);
    padding: 1rem 2.5rem;
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--nav-border-color);
    backdrop-filter: blur(14px);
}

.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-light);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.navbar-brand:hover {
    color: var(--accent-teal-light);
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.navbar-nav > li > a,
.navbar-nav .dropdown-toggle {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: inline-block;
}

.navbar-nav > li > a:hover,
.navbar-nav .dropdown:hover .dropdown-toggle {
    background: var(--navbar-hover-bg);
    color: var(--accent-teal-light);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-toggle::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 6px;
    vertical-align: middle;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    opacity: 0.7;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    list-style: none;
    min-width: 180px;
    z-index: 1000;
    padding-top: 0.5rem;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    left: 0;
    right: 0;
    height: 0.5rem;
}

.dropdown-menu ul {
    list-style: none;
    padding: 0.5rem;
    margin: 0;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li a {
    display: block;
    padding: 0.65rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: all 0.15s ease;
}

.dropdown-menu li a:hover {
    background: var(--menu-hover-bg);
    color: var(--text-primary);
}

/* Navbar bottom right */
.navbar-bottom {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
}

.navbar-bottom a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.navbar-bottom a:hover {
    color: var(--accent-purple);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Logout link */
.logout-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.logout-link:hover {
    background: var(--navbar-hover-bg);
    color: var(--accent-teal-light);
}

/* Language switcher dropdown */
.language-dropdown {
    position: relative;
    margin-left: 1rem;
}

.language-dropdown .lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.language-dropdown .lang-toggle:hover {
    background: var(--navbar-hover-bg);
    color: var(--accent-teal-light);
}

.language-dropdown .globe-icon {
    width: 18px;
    height: 18px;
}

.language-dropdown .lang-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-width: 140px;
    z-index: 1000;
    padding: 0.5rem;
    box-shadow: var(--shadow-lg);
    padding-top: 0.75rem;
}

.language-dropdown .lang-menu::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    left: 0;
    right: 0;
    height: 0.5rem;
}

.language-dropdown:hover .lang-menu {
    display: block;
}

.language-dropdown .lang-menu button {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.65rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
}

.language-dropdown .lang-menu button:hover {
    background: var(--menu-hover-bg);
}

.language-dropdown .lang-menu button.active {
    font-weight: 600;
    color: var(--accent-teal);
}

/* Navbar right flex layout */
.navbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Main content */
.main-content {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 70px);
    padding: 2.5rem;
}

.main-content.full-height {
    min-height: 100vh;
}

.container {
    text-align: center;
    background: var(--bg-secondary);
    padding: 3.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    border: 1px solid var(--container-border-color);
}

h1 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.5px;
}

p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.success {
    color: var(--accent-teal);
    font-weight: 600;
}

.link-button {
    display: inline-block;
    margin-top: 1.75rem;
    padding: 0.85rem 2rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-teal));
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.25s ease;
    box-shadow: 0 4px 15px var(--button-shadow);
}

.link-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--button-shadow-hover);
}

/* Footer */
.footer {
    background: var(--footer-background);
    color: var(--text-light);
    padding: 3rem 2.5rem 1.5rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-teal-light);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.footer-section a:hover {
    opacity: 1;
    color: var(--accent-teal-light);
}

.footer-section p {
    font-size: 0.9rem;
    opacity: 0.8;
    color: var(--text-light);
}

/* Sysinfo link in footer */
.sysinfo-link {
    color: var(--text-light);
    opacity: 0.7;
    text-decoration: none;
    font-size: 0.85rem;
    margin-top: 1rem;
    display: inline-block;
}

.footer-bottom {
    max-width: 1200px;
    margin: 2rem auto 0;
    padding-top: 1.5rem;
    border-top: 1px solid var(--footer-border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
}

.footer-bottom > span {
    opacity: 0.7;
}

.theme-toggle {
    appearance: none;
    border: 1px solid var(--theme-toggle-border);
    background: var(--theme-toggle-bg);
    color: var(--theme-toggle-text);
    border-radius: 999px;
    padding: 0.55rem 1rem;
    font: inherit;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover {
    background: var(--theme-toggle-bg-hover);
    transform: translateY(-1px);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--accent-teal-light);
    outline-offset: 2px;
}

:root[data-theme="workshop"] .navbar-brand {
    font-size: 1.1rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

:root[data-theme="workshop"] .container,
:root[data-theme="workshop"] .dropdown-menu,
:root[data-theme="workshop"] .language-dropdown .lang-menu {
    border-radius: 24px;
}

:root[data-theme="workshop"] .link-button,
:root[data-theme="workshop"] .theme-toggle {
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* Utility classes */
.mt-sm { margin-top: 0.5rem; }
.mt-md { margin-top: 1rem; }
.mt-lg { margin-top: 1.5rem; }
.my-md { margin-top: 1rem; margin-bottom: 1rem; }
.text-left { text-align: left; }

.kb-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
}

@media (max-width: 768px) {
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}