/* ==========================================================================
   AoE2 Unit Analyzer - Base Design System
   Shared foundation for all pages. Page-specific styles go in separate files.
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
    --gold:            #c9a84c;
    --gold-light:      #dbb960;
    --gold-dark:       #8b6914;
    --gold-glow:       rgba(201, 168, 76, 0.15);
    --bg-deep:         #120d07;
    --bg:              #1e1610;
    --bg-warm:         #2a1f14;
    --bg-hover:        #342618;
    --border:          #3d2e1e;
    --border-light:    #5a4228;
    --text:            #e8dcc8;
    --text-muted:      #a89878;
    --text-dim:        #6d5d48;
    --red-accent:      #7a1a1a;
    --red-deep:        #3a0e0e;
    --green:           #5a9a3a;
    --red:             #a83030;
    --team1:           #c0392b;
    --team2:           #2980b9;
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
    --gold:            #8b6914;
    --gold-light:      #a07a1a;
    --gold-dark:       #6b4f0e;
    --gold-glow:       rgba(139, 105, 20, 0.12);
    --bg-deep:         #f4f0e8;
    --bg:              #ece6da;
    --bg-warm:         #e3dbd0;
    --bg-hover:        #d9d0c2;
    --border:          #c8bda8;
    --border-light:    #b5a88e;
    --text:            #2c2416;
    --text-muted:      #6b5d48;
    --text-dim:        #9a8b74;
    --red-accent:      #f5e8e8;
    --red-deep:        #faf2f0;
    --green:           #3a7a22;
    --red:             #b83030;
    --team1:           #b0291c;
    --team2:           #1a6ca0;
}

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

/* ---------- Base Typography ---------- */
body {
    font-family: "Source Sans 3", "Alegreya Sans", sans-serif;
    background: var(--bg-deep);
    background-image: radial-gradient(ellipse at center, rgba(42, 31, 20, 0.4) 0%, transparent 70%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

[data-theme="light"] body {
    background-image: radial-gradient(ellipse at center, rgba(200, 189, 168, 0.3) 0%, transparent 70%);
}

/* Smooth theme transition */
body,
body *:not(#battleCanvas):not(.spinner):not(img) {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

h1, h2, h3 {
    font-family: "Cinzel", serif;
    color: var(--gold);
}

h1 {
    font-weight: 700;
}

h2, h3 {
    font-weight: 600;
}

a {
    color: var(--gold);
    text-decoration: none;
}

a:hover {
    color: var(--gold-light);
}

/* ---------- Site Navigation ---------- */
.site-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 24px;
    background: linear-gradient(180deg, var(--bg-warm) 0%, var(--bg) 100%);
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.nav-brand {
    font-family: "Cinzel", serif;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--gold);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 0;
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-brand:hover {
    color: var(--gold-light);
}

.nav-brand-icon {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: 2px;
    list-style: none;
    margin-left: auto;
}

/* --- Feature Tabs --- */
.nav-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    padding: 10px 20px 8px;
    border-radius: 8px 8px 0 0;
    position: relative;
    transition: all 0.25s ease;
    border: 1px solid transparent;
    border-bottom: none;
    min-width: 120px;
}

.nav-tab-icon {
    font-size: 1.1rem;
    line-height: 1;
    margin-bottom: 2px;
    opacity: 0.5;
    transition: opacity 0.25s;
}

.nav-tab-label {
    font-family: "Cinzel", serif;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
    transition: color 0.25s;
}

.nav-tab-desc {
    font-size: 0.65rem;
    color: var(--text-dim);
    margin-top: 1px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    transition: color 0.25s;
}

/* Hover state */
.nav-tab:hover {
    background: rgba(201, 168, 76, 0.06);
    border-color: var(--border);
}

.nav-tab:hover .nav-tab-icon {
    opacity: 0.8;
}

.nav-tab:hover .nav-tab-label {
    color: var(--text);
}

.nav-tab:hover .nav-tab-desc {
    color: var(--text-muted);
}

/* Active state */
.nav-tab.active {
    background: var(--bg-deep);
    border-color: var(--border-light);
}

.nav-tab.active::after {
    content: "";
    position: absolute;
    top: 0;
    left: 20%;
    right: 20%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    border-radius: 0 0 2px 2px;
}

.nav-tab.active .nav-tab-icon {
    opacity: 1;
    filter: sepia(1) saturate(3) hue-rotate(10deg) brightness(1.2);
}

.nav-tab.active .nav-tab-label {
    color: var(--gold);
}

.nav-tab.active .nav-tab-desc {
    color: var(--text-muted);
}

/* ---------- Page Header ---------- */
.page-header {
    padding: 20px 24px 16px;
    background: linear-gradient(180deg, var(--red-deep) 0%, var(--bg) 100%);
    border-bottom: 2px solid;
    border-image: linear-gradient(90deg, transparent, var(--gold-dark), var(--gold), var(--gold-dark), transparent) 1;
    text-align: center;
}

.page-header h1 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.page-header .subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ---------- Container ---------- */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 20px;
}

.container-wide {
    max-width: 1600px;
    margin: 0 auto;
    padding: 16px 20px;
}

/* ---------- Cards ---------- */
.card {
    background: var(--bg-warm);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
    border-color: var(--gold-dark);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4), 0 0 8px var(--gold-glow);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 20px;
    border: none;
    border-radius: 6px;
    font-family: "Cinzel", serif;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-gold {
    background: linear-gradient(135deg, var(--gold-dark), var(--gold));
    color: var(--bg-deep);
}

.btn-gold:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(201, 168, 76, 0.3);
}

.btn-gold:disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* ---------- Age Toggle ---------- */
.age-toggle {
    display: flex;
    gap: 4px;
    justify-content: center;
}

.age-btn {
    padding: 6px 18px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-muted);
    font-family: "Source Sans 3", "Alegreya Sans", sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.age-btn:hover {
    border-color: var(--gold-dark);
    color: var(--text);
}

.age-btn.active {
    background: var(--gold-dark);
    color: var(--bg-deep);
    border-color: var(--gold-dark);
    font-weight: 600;
}

/* ---------- Light Mode Card Overrides ---------- */
[data-theme="light"] .card {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
[data-theme="light"] .card:hover {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12), 0 0 8px var(--gold-glow);
}
[data-theme="light"] .nav-tab:hover {
    background: rgba(139, 105, 20, 0.06);
}
[data-theme="light"] .nav-tab.active .nav-tab-icon {
    filter: sepia(1) saturate(4) hue-rotate(10deg) brightness(0.7);
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
    display: flex;
    align-items: center;
    margin-left: 8px;
    flex-shrink: 0;
}

.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 20px;
    cursor: pointer;
    padding: 6px 10px;
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: "Source Sans 3", "Alegreya Sans", sans-serif;
    font-weight: 500;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.theme-toggle-btn:hover {
    border-color: var(--gold-dark);
    color: var(--text);
    background: var(--bg-hover);
}

.theme-toggle-btn .toggle-icon {
    font-size: 0.9rem;
    line-height: 1;
}

.theme-toggle-label {
    font-size: 0.7rem;
    letter-spacing: 0.02em;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .site-nav {
        padding: 0 12px;
        gap: 8px;
    }

    .nav-brand {
        font-size: 0.8rem;
    }

    .nav-brand-icon {
        display: none;
    }

    .nav-tab {
        padding: 8px 12px 6px;
        min-width: 0;
    }

    .nav-tab-desc {
        display: none;
    }

    .nav-tab-icon {
        font-size: 0.95rem;
    }

    .nav-tab-label {
        font-size: 0.75rem;
    }

    .theme-toggle-label {
        display: none;
    }

    .theme-toggle-btn {
        padding: 6px 8px;
    }
}

@media (max-width: 600px) {
    .site-nav {
        flex-wrap: wrap;
        padding: 8px 12px 0;
    }

    .nav-brand {
        width: 100%;
        padding: 0 0 6px;
        border-bottom: 1px solid var(--border);
    }

    .nav-links {
        width: 100%;
        margin-left: 0;
        justify-content: space-around;
    }

    .nav-tab {
        padding: 6px 8px 4px;
        flex: 1;
        min-width: 0;
    }

    .nav-tab-icon {
        font-size: 1rem;
    }

    .nav-tab-label {
        font-size: 0.7rem;
    }
}

@media (max-width: 768px) {
    .page-header {
        padding: 12px 16px;
    }

    .page-header h1 {
        font-size: 1.2rem;
    }

    .container,
    .container-wide {
        padding: 12px;
    }
}