/* ============================================================
   style.css — Mobile-first responsive styles for Through the Ages
   ============================================================ */

:root {
    --era-color: #8B7355;
    --bg-card: rgba(255, 255, 255, 0.08);
    --bg-card-hover: rgba(255, 255, 255, 0.12);
    --text-primary: #f0e6d6;
    --text-secondary: rgba(240, 230, 214, 0.7);
    --text-dim: rgba(240, 230, 214, 0.4);
    --accent: var(--era-color);
    --success: #4ade80;
    --danger: #ef4444;
    --radius: 12px;
    --radius-sm: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-primary);
    background: linear-gradient(180deg, #2c1810 0%, #4a3728 40%, #6b5340 100%);
    user-select: none;
    -webkit-user-select: none;
}

/* ---- Layout ---- */
.game-container {
    display: flex;
    flex-direction: column;
    height: 100dvh;
    max-width: 480px;
    margin: 0 auto;
    position: relative;
}

/* ---- Header ---- */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    flex-shrink: 0;
}

.era-info {
    display: flex;
    flex-direction: column;
}

.era-name {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.era-description {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ---- Tab Panels ---- */
.panels {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.tab-panel {
    position: absolute;
    inset: 0;
    padding: 16px;
    overflow-y: auto;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    -webkit-overflow-scrolling: touch;
}

.tab-panel.active {
    opacity: 1;
    pointer-events: auto;
}

/* ---- Main Panel ---- */
.resource-display {
    text-align: center;
    padding: 20px 0 10px;
}

.knowledge-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.knowledge-amount {
    font-size: 2.8rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    line-height: 1.1;
}

.knowledge-rate {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.population-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ---- Discover Button ---- */
.discover-area {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

.discover-btn {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 3px solid var(--era-color);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: transform 0.1s, box-shadow 0.1s, background 0.1s;
    box-shadow: 0 0 20px rgba(139, 115, 85, 0.2);
}

.discover-btn:active {
    transform: scale(0.93);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 30px rgba(139, 115, 85, 0.4);
}

.discover-btn .click-label {
    font-size: 1.3rem;
    letter-spacing: 1px;
}

.discover-btn .click-value {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.auto-gen-info {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ---- Era Progress ---- */
.era-progress {
    margin: 20px 0 10px;
    padding: 0 8px;
}

.era-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.progress-bar {
    width: 100%;
    height: 10px;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 5px;
    background: linear-gradient(90deg, var(--era-color), var(--era-color));
    transition: width 0.3s ease;
    min-width: 0;
}

/* ---- Advance Era Button ---- */
.advance-era-btn {
    display: none;
    width: 100%;
    padding: 14px;
    margin-top: 12px;
    border: 2px solid var(--success);
    border-radius: var(--radius);
    background: rgba(74, 222, 128, 0.1);
    color: var(--success);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    animation: pulse-glow 2s ease-in-out infinite;
}

.advance-era-btn.visible {
    display: block;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 10px rgba(74, 222, 128, 0.2); }
    50% { box-shadow: 0 0 25px rgba(74, 222, 128, 0.4); }
}

/* ---- Upgrade Cards ---- */
.upgrade-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-bottom: 20px;
}

.upgrade-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, transform 0.1s;
    text-align: left;
    width: 100%;
    color: var(--text-primary);
    font-family: inherit;
    font-size: inherit;
}

.upgrade-card:active:not(.maxed) {
    transform: scale(0.98);
}

.upgrade-card.affordable {
    border-color: var(--era-color);
    background: var(--bg-card-hover);
}

.upgrade-card.maxed {
    opacity: 0.5;
    cursor: default;
}

.upgrade-card.purchase-flash {
    background: rgba(74, 222, 128, 0.2) !important;
}

.upgrade-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
    width: 40px;
    text-align: center;
}

.upgrade-info {
    flex: 1;
    min-width: 0;
}

.upgrade-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.upgrade-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.upgrade-flavor {
    font-size: 0.7rem;
    color: var(--text-dim);
    font-style: italic;
    margin-top: 2px;
}

.upgrade-cost-area {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
    flex-shrink: 0;
}

.upgrade-cost {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--success);
}

.upgrade-cost.too-expensive {
    color: var(--danger);
}

.upgrade-maxed {
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.upgrade-count {
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* ---- Settings Panel ---- */
.settings-section {
    margin-bottom: 24px;
}

.settings-section h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 0.85rem;
}

.stat-row span:first-child {
    color: var(--text-secondary);
}

.settings-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.settings-btn {
    padding: 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s;
}

.settings-btn:active {
    background: var(--bg-card-hover);
}

.settings-btn.danger {
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

/* ---- Bottom Navigation ---- */
.bottom-nav {
    display: flex;
    flex-shrink: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.tab-btn {
    flex: 1;
    padding: 10px 0;
    border: none;
    background: none;
    color: var(--text-dim);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    transition: color 0.2s;
    font-family: inherit;
}

.tab-btn.active {
    color: var(--era-color);
}

.tab-btn .tab-icon {
    font-size: 1.2rem;
}

/* ---- Click Floater Animation ---- */
.click-floater {
    position: fixed;
    pointer-events: none;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--era-color);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    animation: float-up 0.8s ease-out forwards;
    z-index: 100;
}

@keyframes float-up {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-60px); }
}

/* ---- Toast ---- */
#toast-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 90%;
    max-width: 400px;
    pointer-events: none;
}

.toast {
    background: rgba(30, 30, 30, 0.95);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    text-align: center;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s, transform 0.3s;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Tutorial Overlay ---- */
.tutorial-overlay {
    position: fixed;
    inset: 0;
    z-index: 150;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 0 16px 100px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}

.tutorial-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.tutorial-bubble {
    background: rgba(20, 20, 40, 0.95);
    border: 1px solid var(--era-color);
    border-radius: var(--radius);
    padding: 16px 20px;
    max-width: 350px;
    font-size: 0.9rem;
    line-height: 1.5;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.tutorial-bubble strong {
    color: var(--era-color);
}

.tutorial-dismiss {
    display: inline-block;
    margin-top: 10px;
    padding: 6px 16px;
    font-size: 0.75rem;
    color: var(--text-dim);
    cursor: pointer;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 4px;
    background: none;
    font-family: inherit;
}

/* ---- Tutorial Highlight ---- */
.tutorial-highlight {
    position: relative;
    z-index: 160;
    animation: tutorial-pulse 1.5s ease-in-out infinite;
}

@keyframes tutorial-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(139, 115, 85, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(139, 115, 85, 0); }
}

/* ---- Legacy Panel ---- */
.heritage-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 0;
    font-size: 1.2rem;
    font-weight: 700;
}

.heritage-icon { font-size: 1.5rem; }
.heritage-label { flex: 1; }
.heritage-amount {
    font-size: 1.4rem;
    color: #DAA520;
    font-weight: 800;
}

.heritage-total {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-bottom: 16px;
}

.legacy-section-title {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 20px 0 10px;
}

.heritage-bonus-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.heritage-card {
    border-color: rgba(218, 165, 32, 0.2) !important;
}

.heritage-card.affordable {
    border-color: #DAA520 !important;
}

/* ---- Achievement Grid ---- */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 8px;
    padding-bottom: 20px;
}

.achievement-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 6px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    text-align: center;
}

.achievement-tile.unlocked {
    border-color: rgba(218, 165, 32, 0.3);
    background: rgba(218, 165, 32, 0.08);
}

.achievement-tile.locked {
    opacity: 0.4;
}

.achievement-icon {
    font-size: 1.5rem;
}

.achievement-name {
    font-size: 0.6rem;
    color: var(--text-secondary);
    line-height: 1.2;
}

/* ---- Tab Badge ---- */
.tab-badge {
    display: none;
    position: absolute;
    top: 4px;
    right: 50%;
    transform: translateX(16px);
    min-width: 16px;
    height: 16px;
    border-radius: 8px;
    background: #DAA520;
    color: #000;
    font-size: 0.55rem;
    font-weight: 800;
    line-height: 16px;
    text-align: center;
    padding: 0 4px;
}

.tab-badge.visible {
    display: block;
}

.tab-btn {
    position: relative;
}

/* ---- User Profile ---- */
.user-info {
    display: flex;
    align-items: center;
    padding: 8px 0;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--era-color);
}

.user-avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--era-color);
    font-size: 1.2rem;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.user-email {
    font-size: 0.7rem;
    color: var(--text-dim);
}

.user-offline {
    font-size: 0.85rem;
    color: var(--text-dim);
}

.google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: rgba(66, 133, 244, 0.1) !important;
    border-color: rgba(66, 133, 244, 0.3) !important;
    color: #8ab4f8 !important;
}

.google-btn:active {
    background: rgba(66, 133, 244, 0.2) !important;
}

.google-icon {
    flex-shrink: 0;
}

/* ---- Name Input ---- */
.name-input-row {
    display: flex;
    gap: 8px;
}

.name-input {
    flex: 1;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
}

.name-input:focus {
    border-color: var(--era-color);
}

.name-input-row .settings-btn {
    flex-shrink: 0;
    width: 60px;
}

/* ---- Leaderboard ---- */
.leaderboard-container {
    margin-top: 8px;
}

.leaderboard-loading, .leaderboard-empty {
    text-align: center;
    color: var(--text-dim);
    padding: 16px;
    font-size: 0.85rem;
}

.leaderboard-table {
    margin-top: 12px;
}

.lb-header {
    display: grid;
    grid-template-columns: 30px 1fr 70px 70px;
    gap: 8px;
    padding: 6px 8px;
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.lb-row {
    display: grid;
    grid-template-columns: 30px 1fr 70px 70px;
    gap: 8px;
    padding: 8px;
    font-size: 0.8rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.lb-row.lb-current {
    background: rgba(218, 165, 32, 0.1);
    border-radius: var(--radius-sm);
}

.lb-rank {
    color: var(--text-dim);
    font-weight: 700;
}

.lb-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.lb-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    flex-shrink: 0;
}

.lb-era {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.lb-score {
    text-align: right;
    color: var(--era-color);
    font-weight: 600;
}

/* ---- Scrollbar ---- */
.tab-panel::-webkit-scrollbar {
    width: 4px;
}

.tab-panel::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
}