/* ═══════════════════════════════════════════════════
   NavalStrike – Design System
   Premium Dark Naval Theme
   ═══════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;600&display=swap');

/* ─── CSS Variables ──────────────────────────────── */
:root {
    /* Ocean Palette */
    --ocean-900: #020c1b;
    --ocean-800: #0a192f;
    --ocean-700: #112240;
    --ocean-600: #1d3461;
    --ocean-500: #233d5e;
    --ocean-400: #2d4a6f;
    --ocean-300: #4a7c9b;
    --ocean-200: #7fb3d3;
    --ocean-100: #b8dae8;

    /* Accent Colors */
    --accent-cyan: #00e5ff;
    --accent-cyan-glow: rgba(0, 229, 255, 0.3);
    --accent-gold: #ffd700;
    --accent-gold-glow: rgba(255, 215, 0, 0.3);
    --accent-red: #ff3d5a;
    --accent-red-glow: rgba(255, 61, 90, 0.3);
    --accent-green: #00e676;
    --accent-green-glow: rgba(0, 230, 118, 0.3);
    --accent-orange: #ff9100;

    /* Surfaces */
    --surface-glass: rgba(10, 25, 47, 0.75);
    --surface-card: rgba(17, 34, 64, 0.85);
    --surface-elevated: rgba(29, 52, 97, 0.6);
    --surface-overlay: rgba(2, 12, 27, 0.9);

    /* Borders */
    --border-subtle: rgba(100, 180, 255, 0.1);
    --border-glow: rgba(0, 229, 255, 0.3);

    /* Text */
    --text-primary: #e6f1ff;
    --text-secondary: #8892b0;
    --text-muted: #5a6a8a;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow-cyan: 0 0 20px rgba(0, 229, 255, 0.2), 0 0 60px rgba(0, 229, 255, 0.1);
    --shadow-glow-gold: 0 0 20px rgba(255, 215, 0, 0.2), 0 0 60px rgba(255, 215, 0, 0.1);

    /* Transitions */
    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);

    /* Font */
    --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    background: var(--ocean-900);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ─── App Container ──────────────────────────────── */
#app {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ─── Screen System ──────────────────────────────── */
.screen {
    display: none;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: var(--space-lg);
    position: relative;
    z-index: 1;
}

.screen.active {
    display: flex;
    animation: screenFadeIn 0.5s var(--ease-out);
}

@keyframes screenFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── Typography ─────────────────────────────────── */
.title-xl {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.title-lg {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.title-md {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 600;
    line-height: 1.3;
}

.title-sm {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-glow {
    text-shadow: 0 0 20px var(--accent-cyan-glow), 0 0 40px var(--accent-cyan-glow);
}

/* ─── Glass Card ─────────────────────────────────── */
.card {
    background: var(--surface-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

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

.card--glass {
    background: var(--surface-glass);
    border-color: var(--border-glow);
}

/* ─── Buttons ────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 28px;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:active {
    transform: scale(0.97);
}

.btn--primary {
    background: linear-gradient(135deg, #0077cc, var(--accent-cyan));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 119, 204, 0.4);
}

.btn--primary:hover {
    box-shadow: 0 6px 25px rgba(0, 229, 255, 0.5);
    transform: translateY(-2px);
}

.btn--secondary {
    background: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn--secondary:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow-cyan);
}

.btn--gold {
    background: linear-gradient(135deg, #cc8800, var(--accent-gold));
    color: var(--ocean-900);
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

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

.btn--private {
    background: linear-gradient(135deg, #1a4a6e, #2d6a8f);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(45, 106, 143, 0.3);
}

.btn--private:hover {
    box-shadow: 0 6px 25px rgba(45, 106, 143, 0.5);
    transform: translateY(-2px);
}

.btn--danger {
    background: linear-gradient(135deg, #cc0022, var(--accent-red));
    color: white;
}

.btn--ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 10px 16px;
}

.btn--ghost:hover {
    color: var(--text-primary);
    background: var(--surface-elevated);
}

.btn--lg {
    padding: 18px 40px;
    font-size: 1.15rem;
    border-radius: var(--radius-lg);
}

.btn--full {
    width: 100%;
}

.btn--icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-md);
    font-size: 1.2rem;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

/* ─── Inputs ─────────────────────────────────────── */
.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input {
    padding: 14px 18px;
    background: var(--ocean-800);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    transition: all 0.3s var(--ease-out);
    outline: none;
}

.input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px var(--accent-cyan-glow);
}

.input::placeholder {
    color: var(--text-muted);
}

.input--code {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    padding: 18px;
}

/* ─── Badge ──────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge--host {
    background: var(--accent-gold-glow);
    color: var(--accent-gold);
    border: 1px solid var(--accent-gold);
}

.badge--ready {
    background: var(--accent-green-glow);
    color: var(--accent-green);
}

.badge--waiting {
    background: var(--surface-elevated);
    color: var(--text-secondary);
}

.badge--registered {
    background: rgba(120, 100, 255, 0.2);
    color: #a78bfa;
    border: 1px solid rgba(120, 100, 255, 0.4);
}

/* ─── Player List ────────────────────────────────── */
.player-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    width: 100%;
}

.player-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    background: var(--surface-elevated);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s var(--ease-out);
}

.player-item--ready {
    border-color: var(--accent-green);
    box-shadow: inset 0 0 20px var(--accent-green-glow);
}

.player-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.player-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--ocean-400), var(--accent-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}

/* ─── Lobby Code Display ─────────────────────────── */
.lobby-code {
    font-family: var(--font-mono);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: 0.4em;
    color: var(--accent-cyan);
    text-shadow: 0 0 30px var(--accent-cyan-glow);
    padding: var(--space-lg) var(--space-xl);
    background: var(--surface-glass);
    border: 2px solid var(--border-glow);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    text-align: center;
}

.lobby-code:hover {
    background: rgba(0, 229, 255, 0.05);
    box-shadow: var(--shadow-glow-cyan);
}

.lobby-code:active {
    transform: scale(0.98);
}

/* ─── Timer ──────────────────────────────────────── */
.timer {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.timer--warning {
    color: var(--accent-orange);
    animation: timerPulse 1s ease-in-out infinite;
}

.timer--danger {
    color: var(--accent-red);
    animation: timerPulse 0.5s ease-in-out infinite;
}

@keyframes timerPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ─── Turn Indicator ─────────────────────────────── */
.turn-indicator {
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 1.1rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.turn-indicator--active {
    background: linear-gradient(135deg, rgba(0, 230, 118, 0.15), rgba(0, 229, 255, 0.15));
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
    animation: turnGlow 2s ease-in-out infinite;
}

.turn-indicator--waiting {
    background: var(--surface-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

@keyframes turnGlow {
    0%, 100% { box-shadow: 0 0 10px var(--accent-green-glow); }
    50% { box-shadow: 0 0 30px var(--accent-green-glow), 0 0 60px var(--accent-green-glow); }
}

/* ─── Toast / Notifications ──────────────────────── */
.toast-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    padding: var(--space-md) var(--space-lg);
    background: var(--surface-card);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent-cyan);
    box-shadow: var(--shadow-lg);
    animation: toastSlideIn 0.4s var(--ease-spring);
    max-width: 380px;
    font-size: 0.9rem;
}

.toast--error { border-left-color: var(--accent-red); }
.toast--success { border-left-color: var(--accent-green); }
.toast--warning { border-left-color: var(--accent-orange); }

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

.toast--exit {
    animation: toastSlideOut 0.3s var(--ease-out) forwards;
}

@keyframes toastSlideOut {
    to { opacity: 0; transform: translateX(100px); }
}

/* ─── Modal / Dialog ─────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--surface-overlay);
    backdrop-filter: blur(8px);
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    animation: fadeIn 0.3s var(--ease-out);
}

.modal {
    background: var(--ocean-700);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    animation: modalPop 0.4s var(--ease-spring);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.modal-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

/* ─── Loading Spinner ────────────────────────────── */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ─── Build Info ─────────────────────────────────── */
.build-info {
    position: fixed;
    bottom: var(--space-sm);
    right: var(--space-md);
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    opacity: 0.5;
    z-index: 5;
}

/* ─── Responsive ─────────────────────────────────── */
@media (max-width: 768px) {
    .screen {
        padding: var(--space-md);
    }

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

    .btn--lg {
        padding: 16px 28px;
        font-size: 1rem;
    }

    .modal {
        padding: var(--space-xl);
    }

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

    .toast-container {
        left: var(--space-md);
        right: var(--space-md);
    }

    .toast {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        --space-lg: 16px;
        --space-xl: 24px;
    }
}