/* ============================================
   Nishikigoi Gen - Design System
   ============================================ */

:root {
    /* Colors - Japanese Traditional + Modern */
    --color-bg-deep: #0d1f33;
    --color-bg-water: #1a3a5c;
    --color-accent-gold: #c9a227;
    --color-accent-red: #b33a3a;
    --color-text-primary: #f0e6d3;
    --color-text-secondary: #a89f8f;
    --color-ui-dark: #1a1a1a;
    --color-ui-border: #3a3a3a;

    /* Koi Colors */
    --koi-white: #f5f5f0;
    --koi-red: #cc3333;
    --koi-orange: #e67300;
    --koi-black: #1a1a1a;
    --koi-blue: #4a7ca8;
    --koi-gold: #d4a83c;

    /* Typography */
    --font-main: 'Noto Sans JP', sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
}

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

html,
body {
    height: 100%;
}

body {
    font-family: var(--font-main);
    background: linear-gradient(180deg, var(--color-bg-deep) 0%, #0a1520 100%);
    color: var(--color-text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-sm);
}

/* ============================================
   Layout - Desktop First (Side by Side)
   ============================================ */

.container {
    max-width: 1100px;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: var(--space-sm) 0;
    flex-shrink: 0;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent-gold) 0%, #f0d68a 50%, var(--color-accent-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.1em;
}

.tagline {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

/* ============================================
   Main Content - Side by Side (Desktop)
   ============================================ */

.main-content {
    display: flex;
    gap: var(--space-lg);
    flex: 1;
    min-height: 0;
    align-items: stretch;
}

/* ============================================
   Pond (SVG Container) - Left Side
   ============================================ */

.pond {
    flex: 1.2;
    background: linear-gradient(145deg, var(--color-bg-water) 0%, var(--color-bg-deep) 100%);
    border-radius: 16px;
    padding: var(--space-sm);
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

#koi-canvas {
    width: 100%;
    height: 100%;
    max-height: 100%;
    display: block;
    border-radius: 8px;
}

/* Koi Swimming Animation */
.koi-swim {
    animation: swim 4s ease-in-out infinite;
    transform-origin: center center;
}

@keyframes swim {

    0%,
    100% {
        transform: translateX(0) rotate(0deg);
    }

    25% {
        transform: translateX(10px) rotate(2deg);
    }

    50% {
        transform: translateX(0) rotate(0deg);
    }

    75% {
        transform: translateX(-10px) rotate(-2deg);
    }
}

/* Tail wiggle */
#koi-tail {
    animation: tail-wiggle 0.8s ease-in-out infinite;
    transform-origin: left center;
}

@keyframes tail-wiggle {

    0%,
    100% {
        transform: rotate(0deg) scaleY(1);
    }

    50% {
        transform: rotate(5deg) scaleY(0.9);
    }
}

/* ============================================
   Panel (Controls + Actions) - Right Side
   ============================================ */

.panel {
    flex: 0.8;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-width: 280px;
    max-width: 350px;
    overflow-y: auto;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.control-group {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-ui-border);
    border-radius: 12px;
    padding: var(--space-sm);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-xs);
}

.label-en {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--color-text-primary);
}

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

/* Range Slider */
input[type="range"] {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(90deg, var(--color-bg-deep), var(--color-accent-gold));
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--color-accent-gold);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

/* Select Dropdown */
select {
    width: 100%;
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-main);
    font-size: 0.9rem;
    background: var(--color-ui-dark);
    color: var(--color-text-primary);
    border: 1px solid var(--color-ui-border);
    border-radius: 8px;
    cursor: pointer;
    outline: none;
}

select:focus {
    border-color: var(--color-accent-gold);
}

/* ============================================
   Buttons
   ============================================ */

.actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    margin-top: var(--space-md);
}

.btn {
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 700;
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
}

.btn.primary {
    background: linear-gradient(135deg, var(--color-accent-gold), #e6c24a);
    color: var(--color-ui-dark);
    box-shadow: 0 4px 15px rgba(201, 162, 39, 0.4);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(201, 162, 39, 0.6);
}

.btn.secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-accent-gold);
}

.btn.secondary:hover {
    background: rgba(201, 162, 39, 0.1);
}

/* ============================================
   Footer
   ============================================ */

footer {
    text-align: center;
    padding: var(--space-sm) 0;
    flex-shrink: 0;
}

footer p {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.credit {
    font-size: 0.65rem;
    margin-top: 2px;
    opacity: 0.7;
}

/* ============================================
   Responsive - Mobile (Stacked Layout)
   ============================================ */

@media (max-width: 768px) {
    body {
        padding: var(--space-xs);
        align-items: flex-start;
    }

    .container {
        height: auto;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.75rem;
    }

    /* Stack vertically on mobile */
    .main-content {
        flex-direction: column;
        gap: var(--space-md);
    }

    .pond {
        flex: none;
        min-height: 200px;
        max-height: 40vh;
    }

    .panel {
        flex: none;
        max-width: 100%;
        min-width: auto;
    }

    .controls {
        gap: var(--space-xs);
    }

    .control-group {
        padding: var(--space-xs) var(--space-sm);
    }

    .actions {
        flex-direction: row;
        margin-top: var(--space-sm);
    }

    .btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.85rem;
    }

    footer {
        padding: var(--space-xs) 0;
    }
}

/* Extra small screens */
@media (max-width: 400px) {
    header h1 {
        font-size: 1.3rem;
    }

    .label-en {
        font-size: 0.8rem;
    }

    .btn {
        font-size: 0.8rem;
    }
}