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

/* CSS Variables voor theming */
:root {
    --bg-gradient-1: #667eea;
    --bg-gradient-2: #764ba2;
    --card-bg: white;
    --text-primary: #333;
    --text-secondary: #666;
    --text-tertiary: #999;
    --accent-color: #667eea;
    --stat-bg: #f7f7f7;
    --border-color: #eee;
    --command-bg: #f0f4ff;
    --shadow: rgba(0,0,0,0.2);
}

[data-theme="dark"] {
    --bg-gradient-1: #1a1a2e;
    --bg-gradient-2: #16213e;
    --card-bg: #0f3460;
    --text-primary: #e8e8e8;
    --text-secondary: #b8b8b8;
    --text-tertiary: #888;
    --accent-color: #00d4ff;
    --stat-bg: #1a1a2e;
    --border-color: #2a2a4e;
    --command-bg: #1a3a5a;
    --shadow: rgba(0,0,0,0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
    min-height: 100vh;
    padding: 10px;
    color: var(--text-primary);
    transition: background 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow);
    margin-bottom: 10px;
    transition: background 0.3s ease;
    height: 90px;
    display: flex;
    align-items: center;
    overflow: hidden;
    gap: 15px;
}

.header-left {
    flex: 1;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.header-logo img {
    height: 56px;
    width: auto;
    display: block;
}

h1 {
    color: var(--accent-color);
    font-size: 1.5em;
    margin: 5px 0 3px 0;
    line-height: 1.2;
}

.header p {
    margin: 0;
    padding: 0;
    line-height: 1.2;
    font-size: 0.95em;
}

.navbar {
    background: var(--card-bg);
    padding: 10px 15px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow);
    margin-bottom: 15px;
    transition: background 0.3s ease;
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: nowrap;
}

.nav-spacer {
    flex: 1;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 15px;
    background: var(--stat-bg);
    border-radius: 20px;
    transition: all 0.2s;
    font-weight: 500;
    border: 2px solid var(--border-color);
    font-size: 0.9em;
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.nav-link.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    font-weight: 600;
    pointer-events: none;
}

.theme-toggle {
    background: var(--stat-bg);
    border: 2px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1.1em;
    color: var(--text-primary);
    transition: all 0.2s;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* Language Switcher (single cycling button) */
.lang-btn {
    background: var(--stat-bg);
    border: 2px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1.2em;
    color: var(--text-primary);
    transition: all 0.2s;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* Mobile-First Responsive Design */

/* Compact navbar: icon-only nav links until wide desktop */
@media (max-width: 1400px) {
    .nav-link-text {
        display: none;
    }

    .nav-link {
        padding: 8px 12px;
    }

    .nav-links {
        flex-wrap: wrap;
        row-gap: 8px;
    }
}

/* Small mobile devices (portrait phones) */
@media (max-width: 480px) {
    body {
        padding: 5px;
        font-size: 14px;
    }

    .header {
        padding: 12px;
        border-radius: 10px;
        height: 80px;
    }

    .header-logo img {
        height: 44px;
    }

    h1 {
        font-size: 1.3em;
        margin: 4px 0 2px 0;
        text-align: center;
        line-height: 1.2;
    }

    .navbar {
        padding: 8px 12px;
        border-radius: 10px;
        margin-bottom: 10px;
    }

    .nav-link {
        padding: 6px 10px;
    }

    .nav-link:hover {
        transform: none;
    }

    .theme-toggle {
        padding: 6px 12px;
        font-size: 1em;
    }
}

/* Medium mobile devices (landscape phones, small tablets) */
@media (min-width: 481px) and (max-width: 768px) {
    body {
        padding: 8px;
    }

    .header {
        padding: 15px;
        height: 85px;
    }

    h1 {
        font-size: 1.4em;
        margin: 4px 0 2px 0;
        text-align: center;
        line-height: 1.2;
    }

    .navbar {
        padding: 10px 15px;
        margin-bottom: 12px;
    }
}

/* Tablets */
@media (min-width: 769px) and (max-width: 1024px) {
    body {
        padding: 15px;
    }

    .header {
        padding: 20px;
    }

    .navbar {
        padding: 12px 20px;
        margin-bottom: 15px;
    }

    h1 {
        font-size: 1.6em;
    }

    .nav-link {
        padding: 9px 16px;
    }
}

/* Desktop (larger screens) */
@media (min-width: 1025px) {
    body {
        padding: 20px;
    }

    .header {
        padding: 30px;
    }

    .navbar {
        padding: 15px 30px;
        margin-bottom: 15px;
    }

    h1 {
        font-size: 2em;
        margin-bottom: 10px;
    }

    .nav-link {
        padding: 10px 20px;
        font-size: 1em;
    }

    .theme-toggle {
        padding: 10px 20px;
        font-size: 1.2em;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .nav-link,
    .theme-toggle,
    button,
    a {
        min-width: 44px;
        min-height: 44px;
    }

    .nav-link:active {
        transform: scale(0.95);
    }

    .theme-toggle:active {
        transform: scale(0.95);
    }
}

/* Footer Styles */
footer {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px var(--shadow);
}

footer p {
    color: var(--text-primary);
    margin: 8px 0;
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.2s;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
    opacity: 0.8;
}

footer a svg {
    vertical-align: middle;
    margin-right: 4px;
}

/* Footer mobile responsiveness */
@media (max-width: 480px) {
    footer {
        padding: 15px;
        border-radius: 10px;
    }

    footer p {
        font-size: 0.9em;
        margin: 6px 0;
    }

    footer a {
        display: inline-block;
        margin: 4px 4px;
    }
}

/* Admin alert banner (dashboard only, admin session required) */
.admin-alert-container {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.admin-alert-banner {
    min-width: 280px;
    max-width: 380px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left-width: 4px;
    border-radius: 10px;
    padding: 12px 12px 12px 14px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
    display: flex;
    align-items: flex-start;
    gap: 10px;
    animation: adminAlertSlideIn 180ms ease-out;
}

.admin-alert-title {
    font-weight: 700;
    margin-bottom: 4px;
}

.admin-alert-message {
    color: var(--text-secondary);
    font-size: 0.9em;
    line-height: 1.3;
}

.admin-alert-dismiss {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1em;
    padding: 4px;
    margin-left: auto;
}

.admin-alert-warning {
    border-left-color: var(--warning-color, #f6c453);
}

.admin-alert-error,
.admin-alert-critical {
    border-left-color: var(--error-color, #e35b5b);
}

.admin-alert-info {
    border-left-color: var(--accent-color, #6fb5ff);
}

@keyframes adminAlertSlideIn {
    from {
        transform: translateY(-6px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}