/* =====================================================
   Game Engine 2.0 — Shared Stylesheet
   All CSS variables, reset, common components, utilities
   ===================================================== */

/* ---------- CSS Variables ---------- */
:root {
    /* Primary palette */
    --color-primary: #667eea;
    --color-primary-dark: #764ba2;
    --color-primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Semantic colors */
    --color-success: #28a745;
    --color-success-bg: #d4edda;
    --color-success-text: #155724;
    --color-success-border: #c3e6cb;

    --color-error: #dc3545;
    --color-error-bg: #f8d7da;
    --color-error-text: #721c24;
    --color-error-border: #f5c6cb;

    --color-warning: #ffc107;
    --color-warning-bg: #fff3cd;
    --color-warning-text: #856404;
    --color-warning-border: #ffeaa7;

    --color-info: #38bdf8;
    --color-info-bg: #d1ecf1;
    --color-info-text: #0c5460;
    --color-info-border: #bee5eb;

    /* Neutrals */
    --color-white: #ffffff;
    --color-light: #f8f9fa;
    --color-gray-100: #e0e0e0;
    --color-gray-200: #e7f3ff;
    --color-gray-300: #999;
    --color-gray-400: #666;
    --color-gray-500: #555;
    --color-gray-600: #333;
    --color-dark: #1e293b;

    /* Host gold */
    --color-host: #ffd700;
    --color-host-dark: #ffc107;

    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 10px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-2xl: 28px;
    --font-size-3xl: 32px;
    --font-size-4xl: 56px;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-base: 16px;
    --space-lg: 20px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 40px;

    /* Borders & shadows */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-base: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 999px;

    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.35);

    /* Transitions */
    --transition-fast: 0.2s;
    --transition-base: 0.3s;
    --transition-slow: 0.5s;

    /* Navbar */
    --navbar-height: 64px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--color-primary-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--color-gray-600);
    line-height: 1.5;
}

/* ---------- Navbar ---------- */
.navbar {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--space-base) var(--space-2xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    font-size: var(--font-size-xl);
    font-weight: 700;
    text-decoration: none;
    color: var(--color-white);
}

.navbar-menu {
    display: flex;
    gap: var(--space-lg);
    align-items: center;
}

.navbar-link {
    color: var(--color-white);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-sm) var(--space-base);
    border-radius: var(--radius-md);
    transition: background var(--transition-base);
    font-size: var(--font-size-base);
}

.navbar-link:hover {
    background: rgba(255, 255, 255, 0.2);
}

.navbar-user {
    color: var(--color-white);
    font-weight: 500;
    font-size: var(--font-size-base);
}

/* Mobile hamburger */
.navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: 24px;
    cursor: pointer;
    padding: var(--space-sm);
    line-height: 1;
}

/* ---------- Buttons ---------- */
.btn {
    padding: var(--space-md) var(--space-2xl);
    border: none;
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-primary {
    background: var(--color-primary-gradient);
    color: var(--color-white);
}

.btn-primary-light {
    background: var(--color-white);
    color: var(--color-primary);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

.btn-secondary-gray {
    background: #6c757d;
    color: var(--color-white);
}

.btn-success {
    background: var(--color-success);
    color: var(--color-white);
}

.btn-danger {
    background: var(--color-error);
    color: var(--color-white);
}

.btn-ghost {
    background: transparent;
    color: var(--color-gray-300);
    border: 1px solid var(--color-gray-100);
}

.btn-full {
    width: 100%;
}

.btn-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ---------- Flash Messages ---------- */
.flash-messages {
    margin-bottom: var(--space-lg);
}

.flash {
    padding: var(--space-md) var(--space-base);
    border-radius: var(--radius-base);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-base);
}

.flash.success {
    background: var(--color-success-bg);
    color: var(--color-success-text);
    border: 1px solid var(--color-success-border);
}

.flash.error {
    background: var(--color-error-bg);
    color: var(--color-error-text);
    border: 1px solid var(--color-error-border);
}

.flash.warning {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
    border: 1px solid var(--color-warning-border);
}

.flash.info {
    background: var(--color-info-bg);
    color: var(--color-info-text);
    border: 1px solid var(--color-info-border);
}

/* ---------- Forms ---------- */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--color-gray-600);
    font-weight: 500;
    font-size: var(--font-size-base);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-md) var(--space-base);
    border: 2px solid var(--color-gray-100);
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-base);
    font-family: var(--font-family);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-help {
    font-size: var(--font-size-sm);
    color: var(--color-gray-300);
    margin-top: var(--space-xs);
}

.form-error {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--space-xs);
    display: none;
}

.form-group.has-error input,
.form-group.has-error select {
    border-color: var(--color-error);
}

.form-group.has-error .form-error {
    display: block;
}

/* ---------- Cards & Sections ---------- */
.section {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
    box-shadow: var(--shadow-lg);
}

.section h2 {
    margin-bottom: var(--space-xl);
    color: var(--color-gray-600);
}

.section h3 {
    color: var(--color-gray-600);
    margin-bottom: var(--space-xl);
    font-size: var(--font-size-lg);
}

/* ---------- Badges ---------- */
.badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-base);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.badge-host {
    background: var(--color-host);
    color: var(--color-gray-600);
}

.badge-game {
    background: var(--color-primary);
    color: var(--color-white);
}

/* ---------- Info Box ---------- */
.info-box {
    background: var(--color-gray-200);
    border-left: 4px solid var(--color-primary);
    padding: var(--space-base);
    border-radius: var(--radius-base);
    margin-bottom: var(--space-lg);
}

.info-box p {
    margin: 0;
    color: var(--color-gray-600);
    font-size: var(--font-size-base);
}

/* ---------- Empty State ---------- */
.empty-state {
    text-align: center;
    padding: 60px var(--space-lg);
    color: var(--color-gray-300);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--space-base);
}

/* ---------- Container ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg);
    flex: 1;
}

/* ---------- Connection Status ---------- */
.connection-status {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    padding: var(--space-sm) var(--space-base);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-white);
    opacity: 0;
    transition: opacity var(--transition-base) ease;
    z-index: 1000;
    pointer-events: none;
}

.connection-status.visible {
    opacity: 1;
}

.connection-status.connected {
    background: var(--color-success);
}

.connection-status.disconnected {
    background: var(--color-error);
}

/* ---------- Toast Notifications ---------- */
.toast-container {
    position: fixed;
    top: calc(var(--navbar-height) + var(--space-lg));
    right: var(--space-lg);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-width: 360px;
}

.toast {
    padding: var(--space-md) var(--space-base);
    border-radius: var(--radius-base);
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: 500;
    box-shadow: var(--shadow-md);
    animation: toastSlideIn var(--transition-base) ease forwards;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.toast.toast-success {
    background: var(--color-success);
}

.toast.toast-error {
    background: var(--color-error);
}

.toast.toast-warning {
    background: var(--color-warning);
    color: var(--color-gray-600);
}

.toast.toast-info {
    background: var(--color-info);
}

.toast.toast-hiding {
    animation: toastSlideOut var(--transition-base) ease forwards;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastSlideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

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

@keyframes cardFlip {
    0% {
        transform: rotateY(0deg);
    }
    100% {
        transform: rotateY(180deg);
    }
}

@keyframes dropShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

@keyframes winnerPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ---------- Loading Spinner ---------- */
.spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.spinner-dark {
    border-color: rgba(102, 126, 234, 0.3);
    border-top-color: var(--color-primary);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Skeleton loading */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes skeletonShimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ---------- Responsive ---------- */

/* Tablets and smaller (768px) */
@media (max-width: 768px) {
    .navbar {
        padding: var(--space-md) var(--space-base);
    }

    .navbar-toggle {
        display: block;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(102, 126, 234, 0.95);
        backdrop-filter: blur(10px);
        padding: var(--space-base);
        gap: var(--space-sm);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }

    .navbar-menu.open {
        display: flex;
    }

    .container {
        padding: var(--space-base);
    }

    .btn-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    /* Features grid on landing page */
    .features {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--space-base);
    }

    /* Rooms grid */
    .rooms-grid {
        grid-template-columns: 1fr;
    }

    /* Hero text */
    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .hero > p {
        font-size: var(--font-size-base);
    }

    /* Auth cards */
    .auth-card {
        padding: var(--space-xl);
        max-width: 100%;
    }

    /* Toast positioning */
    .toast-container {
        max-width: calc(100% - var(--space-xl));
        right: var(--space-base);
        left: var(--space-base);
    }

    /* Connection status */
    .connection-status {
        bottom: var(--space-base);
        right: var(--space-base);
        font-size: 12px;
    }
}

/* Small tablets and large phones (600px) */
@media (max-width: 600px) {
    .features {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .cta-buttons .btn {
        width: 100%;
    }

    .header {
        flex-direction: column;
        gap: var(--space-base);
        align-items: stretch !important;
    }

    .header h1 {
        text-align: center;
    }
}

/* Phones (480px) */
@media (max-width: 480px) {
    :root {
        --font-size-4xl: 36px;
        --font-size-3xl: 24px;
        --font-size-2xl: 20px;
        --font-size-xl: 18px;
    }

    .section {
        padding: var(--space-base);
    }

    .navbar-brand {
        font-size: var(--font-size-base);
    }

    .hero h1 {
        font-size: var(--font-size-2xl);
    }

    .feature-card {
        padding: var(--space-base);
    }

    .feature-card h3 {
        font-size: var(--font-size-base);
    }

    .feature-card p {
        font-size: var(--font-size-sm);
    }

    .auth-card {
        padding: var(--space-base);
    }

    .auth-header h1 {
        font-size: var(--font-size-xl);
    }

    /* Modal adjustments */
    .modal-content {
        width: 95%;
        padding: var(--space-base);
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions .btn {
        width: 100%;
    }

    /* Flash messages */
    .flash {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--font-size-sm);
    }

    /* Badges */
    .badge {
        font-size: var(--font-size-xs);
        padding: 2px 6px;
    }
}