/* ══════════════════════════════════════════════════════════════
   HTTP Status Explorer — Premium Dark Mode
   Primary #06B6D4, Accent #67E8F9, BG #0C1222
   ══════════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
    --primary: #06B6D4;
    --primary-light: #22D3EE;
    --primary-dim: rgba(6, 182, 212, 0.15);
    --accent: #67E8F9;
    --bg: #0C1222;
    --bg-card: rgba(20, 30, 48, 0.65);
    --bg-input: rgba(12, 18, 34, 0.9);
    --border: rgba(6, 182, 212, 0.12);
    --border-focus: rgba(6, 182, 212, 0.5);
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-dim: #64748B;
    --glass: rgba(255, 255, 255, 0.04);
    --green: #10B981;
    --orange: #F59E0B;
    --red: #EF4444;
    --purple: #8B5CF6;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --cat-1xx: #22D3EE;
    --cat-2xx: #10B981;
    --cat-3xx: #F59E0B;
    --cat-4xx: #F97316;
    --cat-5xx: #EF4444;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(ellipse at 20% 10%, rgba(6, 182, 212, 0.07) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 85%, rgba(139, 92, 246, 0.04) 0%, transparent 50%);
    pointer-events: none;
}

.app {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.header__brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header__icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 16px rgba(6, 182, 212, 0.3);
}

.header__title {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header__subtitle {
    font-size: 13px;
    color: var(--text-dim);
}

.header__actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary), #0891B2);
    color: #fff;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.25);
}

.btn--primary:hover {
    transform: translateY(-1px);
}

.btn--secondary {
    background: var(--glass);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn--secondary:hover {
    border-color: var(--primary);
}

.btn--active {
    background: var(--primary-dim);
    border-color: var(--primary);
    color: var(--primary-light);
}

.btn--small {
    padding: 6px 12px;
    font-size: 11px;
}

/* Search */
.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    align-items: center;
}

.search-bar input {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px 10px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-dim);
}

.search-bar input::placeholder {
    color: var(--text-dim);
}

.search-wrapper {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-wrapper::before {
    content: '🔍';
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    pointer-events: none;
}

/* Category tabs */
.category-tabs {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.category-tab:hover {
    border-color: var(--primary);
    color: var(--text);
}

.category-tab--active {
    border-color: transparent;
    font-weight: 700;
}

.category-tab[data-cat="all"].category-tab--active {
    background: var(--primary-dim);
    color: var(--primary-light);
}

.category-tab[data-cat="1xx"].category-tab--active {
    background: rgba(34, 211, 238, 0.15);
    color: var(--cat-1xx);
}

.category-tab[data-cat="2xx"].category-tab--active {
    background: rgba(16, 185, 129, 0.15);
    color: var(--cat-2xx);
}

.category-tab[data-cat="3xx"].category-tab--active {
    background: rgba(245, 158, 11, 0.15);
    color: var(--cat-3xx);
}

.category-tab[data-cat="4xx"].category-tab--active {
    background: rgba(249, 115, 22, 0.15);
    color: var(--cat-4xx);
}

.category-tab[data-cat="5xx"].category-tab--active {
    background: rgba(239, 68, 68, 0.15);
    color: var(--cat-5xx);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 14px;
    margin-top: 16px;
}

.status-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.status-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: rgba(6, 182, 212, 0.2);
}

.status-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.status-card[data-cat="1xx"]::before {
    background: var(--cat-1xx);
}

.status-card[data-cat="2xx"]::before {
    background: var(--cat-2xx);
}

.status-card[data-cat="3xx"]::before {
    background: var(--cat-3xx);
}

.status-card[data-cat="4xx"]::before {
    background: var(--cat-4xx);
}

.status-card[data-cat="5xx"]::before {
    background: var(--cat-5xx);
}

.status-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.status-card__code {
    font-size: 22px;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
}

.status-card[data-cat="1xx"] .status-card__code {
    color: var(--cat-1xx);
}

.status-card[data-cat="2xx"] .status-card__code {
    color: var(--cat-2xx);
}

.status-card[data-cat="3xx"] .status-card__code {
    color: var(--cat-3xx);
}

.status-card[data-cat="4xx"] .status-card__code {
    color: var(--cat-4xx);
}

.status-card[data-cat="5xx"] .status-card__code {
    color: var(--cat-5xx);
}

.status-card__name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}

.status-card__desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.status-card__bookmark {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    opacity: 0.3;
    transition: var(--transition);
}

.status-card__bookmark:hover {
    opacity: 1;
}

.status-card__bookmark--active {
    opacity: 1;
}

/* Detail Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay--active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background: #141E30;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    max-width: 700px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal__close {
    background: none;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 16px;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal__close:hover {
    border-color: var(--red);
    color: var(--red);
}

.modal__code {
    font-size: 32px;
    font-weight: 900;
    font-family: 'JetBrains Mono', monospace;
}

.modal__name {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.modal__desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.modal__section {
    margin-bottom: 16px;
}

.modal__section-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dim);
    margin-bottom: 8px;
}

.code-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
}

.code-tab {
    padding: 4px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-dim);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.code-tab--active {
    background: var(--primary-dim);
    border-color: var(--primary);
    color: var(--primary-light);
}

.code-block {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    line-height: 1.6;
    overflow-x: auto;
    position: relative;
    color: var(--accent);
}

.code-block__copy {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 10px;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
}

.code-block__copy:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

.rfc-link {
    color: var(--primary-light);
    text-decoration: none;
    font-size: 13px;
}

.rfc-link:hover {
    text-decoration: underline;
}

/* Quiz */
.quiz-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    backdrop-filter: blur(8px);
    text-align: center;
}

.quiz-panel__question {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}

.quiz-panel__options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    max-width: 500px;
    margin: 0 auto;
}

.quiz-option {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--glass);
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.quiz-option:hover {
    border-color: var(--primary);
}

.quiz-option--correct {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--green);
    color: var(--green);
}

.quiz-option--wrong {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--red);
    color: var(--red);
}

.quiz-score {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 12px;
}

/* Toast */
.toast-container {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    color: #fff;
    animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
    box-shadow: var(--shadow);
}

.toast--success {
    background: rgba(16, 185, 129, 0.9);
}

.toast--info {
    background: rgba(6, 182, 212, 0.9);
}

@keyframes toastIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes toastOut {
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .quiz-panel__options {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .app {
        padding: 12px;
    }
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}