/**
 * zukan.css — いきもん図鑑 Species Index Stylesheet
 * Golden Ratio Design System (φ = 1.618)
 * 
 * Spacing Scale (Fibonacci-ish): 8 / 13 / 21 / 34 / 55 / 89px
 * Card Ratio: 1 : 1.618 (width : height)
 * Photo : Text = 61.8% : 38.2%
 */

/* ── Golden Ratio Variables ── */
:root {
    --phi: 1.618;
    --phi-inv: 0.618;
    --zukan-space-xs: 8px;
    --zukan-space-sm: 13px;
    --zukan-space-md: 21px;
    --zukan-space-lg: 34px;
    --zukan-space-xl: 55px;
    --zukan-space-2xl: 89px;
    --zukan-card-ratio: 1.618;
    --zukan-photo-ratio: 0.618;
    /* 61.8% of card height for photo */
    --zukan-text-ratio: 0.382;
    /* 38.2% for text area */
}

/* ── Hero Stats ── */
.zukan-hero {
    background: linear-gradient(135deg,
            var(--color-primary-surface) 0%,
            rgba(14, 165, 233, 0.04) 50%,
            rgba(245, 158, 11, 0.03) 100%);
    border-bottom: 1px solid var(--color-border);
    padding: var(--zukan-space-lg) var(--zukan-space-md);
}

.zukan-hero__inner {
    max-width: var(--content-max-width, 1200px);
    margin: 0 auto;
}

.zukan-hero__title {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 900;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--zukan-space-xs);
}

.zukan-hero__subtitle {
    font-size: var(--text-sm, 0.875rem);
    color: var(--color-text-muted);
    margin-bottom: var(--zukan-space-md);
}

.zukan-stats {
    display: flex;
    gap: var(--zukan-space-sm);
    flex-wrap: wrap;
}

.zukan-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--zukan-space-sm) var(--zukan-space-md);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 12px);
    min-width: 100px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.zukan-stat__number {
    font-family: var(--font-heading);
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 900;
    color: var(--color-primary-dark);
    line-height: 1;
    letter-spacing: -0.03em;
}

.zukan-stat__number--accent {
    color: var(--color-accent, #f59e0b);
}

.zukan-stat__number--secondary {
    color: var(--color-secondary, #0ea5e9);
}

.zukan-stat__label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 4px;
}

/* ── My Collection Progress ── */
.zukan-progress {
    margin-top: var(--zukan-space-md);
    padding: var(--zukan-space-sm) var(--zukan-space-md);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 12px);
}

.zukan-progress__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--zukan-space-xs);
}

.zukan-progress__label {
    font-size: var(--text-sm, 0.875rem);
    font-weight: 700;
    color: var(--color-text);
}

.zukan-progress__count {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-primary-dark);
}

.zukan-progress__bar {
    width: 100%;
    height: 8px;
    background: rgba(0, 0, 0, 0.06);
    border-radius: 9999px;
    overflow: hidden;
}

.zukan-progress__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: 9999px;
    transition: width 1s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Search + Filter Bar ── */
.zukan-toolbar {
    max-width: var(--content-max-width, 1200px);
    margin: 0 auto;
    padding: var(--zukan-space-md);
    display: flex;
    flex-direction: column;
    gap: var(--zukan-space-sm);
}

.zukan-search {
    position: relative;
    width: 100%;
}

.zukan-search__input {
    width: 100%;
    padding: var(--zukan-space-sm) var(--zukan-space-md) var(--zukan-space-sm) 44px;
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    background: var(--color-bg-surface, #fff);
    font-size: var(--text-sm, 0.875rem);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.zukan-search__input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-focus-ring);
}

.zukan-search__icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-faint);
    pointer-events: none;
}

.zukan-filters {
    display: flex;
    gap: var(--zukan-space-xs);
    overflow-x: auto;
    padding-bottom: 4px;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.zukan-filters::-webkit-scrollbar {
    display: none;
}

.zukan-filter-chip {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
    border: 1px solid var(--color-border);
    background: var(--color-bg-surface, #fff);
    color: var(--color-text-muted);
    transition: all 0.2s ease;
}

.zukan-filter-chip:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
    background: var(--color-primary-surface, rgba(16, 185, 129, 0.06));
}

.zukan-filter-chip--active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-primary-sm);
}

.zukan-filter-chip--active:hover {
    background: var(--color-primary-dark);
    color: white;
}

/* Sort Controls */
.zukan-sort {
    display: flex;
    align-items: center;
    gap: var(--zukan-space-xs);
    margin-left: auto;
}

.zukan-sort__label {
    font-size: 0.75rem;
    color: var(--color-text-faint);
    white-space: nowrap;
}

.zukan-sort__select {
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md, 8px);
    font-size: 0.8rem;
    color: var(--color-text);
    background: var(--color-bg-surface, #fff);
    cursor: pointer;
    outline: none;
}

/* ── Species Card Grid ── */
.zukan-grid {
    max-width: var(--content-max-width, 1200px);
    margin: 0 auto;
    padding: 0 var(--zukan-space-md) var(--zukan-space-lg);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--zukan-space-sm);
}

@media (min-width: 640px) {
    .zukan-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--zukan-space-md);
    }
}

@media (min-width: 1024px) {
    .zukan-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--zukan-space-md);
    }
}

/* ── Species Card (Golden Ratio) ── */
.zukan-card {
    position: relative;
    border-radius: var(--radius-lg, 12px);
    overflow: hidden;
    background: white;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.1));
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.zukan-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
    border-color: var(--color-primary-glow);
}

.zukan-card:active {
    transform: scale(0.98);
}

/* Card entrance animation */
.zukan-card--animated {
    opacity: 0;
    transform: translateY(var(--zukan-space-md));
    animation: zukan-card-in 0.5s ease forwards;
}

@keyframes zukan-card-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Photo Area — 61.8% of card */
.zukan-card__photo {
    position: relative;
    width: 100%;
    padding-top: calc(100% * var(--zukan-photo-ratio));
    overflow: hidden;
    background: linear-gradient(135deg, #f0f4f0 0%, #e8ede8 100%);
}

.zukan-card__img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.zukan-card:hover .zukan-card__img {
    transform: scale(1.05);
}

.zukan-card__placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-faint);
}

/* Red List badge overlay */
.zukan-card__rl {
    position: absolute;
    top: var(--zukan-space-xs);
    right: var(--zukan-space-xs);
    padding: 3px 8px;
    border-radius: 9999px;
    font-size: var(--text-xs);
    font-weight: 800;
    letter-spacing: 0.05em;
    backdrop-filter: blur(4px);
}

.zukan-card__rl--cr {
    background: rgba(220, 38, 38, 0.85);
    color: white;
}

.zukan-card__rl--en {
    background: rgba(234, 88, 12, 0.85);
    color: white;
}

.zukan-card__rl--vu {
    background: rgba(245, 158, 11, 0.85);
    color: white;
}

.zukan-card__rl--nt {
    background: rgba(14, 165, 233, 0.75);
    color: white;
}

/* Research Grade star */
.zukan-card__rg {
    position: absolute;
    top: var(--zukan-space-xs);
    left: var(--zukan-space-xs);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 158, 11, 0.9);
    border-radius: 50%;
    font-size: 12px;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

/* Text Area — 38.2% */
.zukan-card__body {
    padding: var(--zukan-space-sm);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.zukan-card__name {
    font-weight: 800;
    font-size: clamp(0.8rem, 2vw, 0.95rem);
    color: var(--color-text);
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.zukan-card__sci {
    font-size: var(--text-xs);
    font-style: italic;
    color: var(--color-text-faint);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.zukan-card__meta {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: auto;
    padding-top: 4px;
}

.zukan-card__count {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 3px;
}

.zukan-card__observers {
    font-size: 0.7rem;
    color: var(--color-text-faint);
    display: flex;
    align-items: center;
    gap: 3px;
    margin-left: auto;
}

/* ── Loading States ── */
.zukan-loading {
    display: flex;
    justify-content: center;
    padding: var(--zukan-space-xl) 0;
}

.zukan-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: zukan-spin 0.8s linear infinite;
}

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

.zukan-empty {
    text-align: center;
    padding: var(--zukan-space-xl) var(--zukan-space-md);
    color: var(--color-text-muted);
}

.zukan-empty__icon {
    font-size: 3rem;
    margin-bottom: var(--zukan-space-sm);
    opacity: 0.4;
}

.zukan-empty__text {
    font-size: var(--text-sm, 0.875rem);
    font-weight: 500;
}

/* ── Load More Button ── */
.zukan-loadmore {
    display: flex;
    justify-content: center;
    padding: var(--zukan-space-md) 0 var(--zukan-space-xl);
    max-width: var(--content-max-width, 1200px);
    margin: 0 auto;
}

.zukan-loadmore__btn {
    padding: var(--zukan-space-sm) var(--zukan-space-lg);
    border-radius: 9999px;
    font-weight: 700;
    font-size: var(--text-sm, 0.875rem);
    border: 1px solid var(--color-border-strong, #ddd);
    background: white;
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.zukan-loadmore__btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
    box-shadow: var(--shadow-sm);
}

.zukan-loadmore__btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ── Guest Banner ── */
.zukan-guest-banner {
    max-width: var(--content-max-width, 1200px);
    margin: 0 auto var(--zukan-space-md);
    padding: var(--zukan-space-md);
}

.zukan-guest-banner__card {
    background: linear-gradient(135deg, var(--color-primary-surface, rgba(16, 185, 129, 0.06)) 0%, rgba(14, 165, 233, 0.04) 100%);
    border: 1px solid var(--color-primary-glow, rgba(16, 185, 129, 0.15));
    border-radius: var(--radius-lg, 12px);
    padding: var(--zukan-space-md) var(--zukan-space-lg);
    display: flex;
    align-items: center;
    gap: var(--zukan-space-md);
    flex-wrap: wrap;
}

.zukan-guest-banner__text {
    flex: 1;
    min-width: 200px;
}

.zukan-guest-banner__heading {
    font-weight: 800;
    font-size: 1rem;
    color: var(--color-text);
    margin-bottom: 4px;
}

.zukan-guest-banner__desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ── Responsive Adjustments ── */
@media (max-width: 480px) {
    .zukan-hero {
        padding: var(--zukan-space-md) var(--zukan-space-sm);
    }

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

    .zukan-stat {
        padding: var(--zukan-space-xs) var(--zukan-space-sm);
        min-width: 80px;
    }

    .zukan-stat__number {
        font-size: 1.4rem;
    }

    .zukan-toolbar {
        padding: var(--zukan-space-sm);
    }

    .zukan-grid {
        padding: 0 var(--zukan-space-sm) var(--zukan-space-md);
        gap: var(--zukan-space-xs);
    }

    .zukan-card__body {
        padding: var(--zukan-space-xs) var(--zukan-space-sm);
    }
}