/* === Theme variables === */
:root,
:root[data-theme="light"],
html[data-theme="light"] {
    --bg: #ffffff;
    --grid-line: rgba(29, 29, 31, 0.05);
    --text-primary: #1d1d1f;
    --text-secondary: #3a3a3c;
    --text-muted: #6e6e73;
    --text-placeholder: #86868b;
    --surface: rgba(255, 255, 255, 0.78);
    --surface-2: #f5f5f7;
    --surface-solid: #ffffff;
    --border: #e5e5ea;
    --border-soft: rgba(29, 29, 31, 0.1);
    --topbar-bg: rgba(255, 255, 255, 0.5);
    /* textbox: slightly darker than page, blurred */
    --search-bg: rgba(238, 238, 242, 0.72);
    --search-border: rgba(29, 29, 31, 0.12);
    --card-bg: #ffffff;
    --card-footer-border: #f0f0f5;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --grid-size: 56px;

    --accent: #4ade80;
    --accent-strong: #16a34a;
    --accent-ink: #052e16;
    --accent-soft: rgba(74, 222, 128, 0.5);
    --accent-hover: rgba(74, 222, 128, 0.68);
    --accent-border: rgba(34, 197, 94, 0.45);
    --accent-glow: rgba(74, 222, 128, 0.35);
    --danger: #d64545;
    color-scheme: light;
}

html[data-theme="dark"] {
    --bg: #0e1110;
    --grid-line: rgba(255, 255, 255, 0.07);
    --text-primary: #f5f5f7;
    --text-secondary: #d4d4d8;
    --text-muted: #a1a1aa;
    /* lighter placeholder in dark: not white, not muted-gray, but lighter */
    --text-placeholder: #b3c0b7;
    --surface: rgba(24, 28, 26, 0.72);
    --surface-2: #1a1f1c;
    --surface-solid: #171b19;
    --border: #2a322e;
    --border-soft: rgba(255, 255, 255, 0.12);
    --topbar-bg: rgba(14, 17, 16, 0.5);
    /* textbox: slightly lighter than page, blurred */
    --search-bg: rgba(255, 255, 255, 0.06);
    --search-border: rgba(255, 255, 255, 0.14);
    --card-bg: #171b19;
    --card-footer-border: #262d29;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
    --grid-size: 56px;

    --accent: #86efac;
    --accent-strong: #4ade80;
    --accent-ink: #052e16;
    --accent-soft: rgba(74, 222, 128, 0.32);
    --accent-hover: rgba(134, 239, 172, 0.45);
    --accent-border: rgba(134, 239, 172, 0.4);
    --accent-glow: rgba(74, 222, 128, 0.25);
    --danger: #ff9d94;
    color-scheme: dark;
}

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

/* Reserve scrollbar space so switching pages never shifts layout width */
html {
    scrollbar-gutter: stable;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    /* Bigger grid, offset follows cursor via --gx / --gy for a subtle volumetric feel */
    background-image:
        linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    background-position: calc(50% + var(--gx, 0px)) calc(0px + var(--gy, 0px));
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    will-change: background-position;
}

/* === Topbar === */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    z-index: 200;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 0 20px;
    background: var(--topbar-bg);
    backdrop-filter: blur(18px) saturate(1.4);
    -webkit-backdrop-filter: blur(18px) saturate(1.4);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.topbar-brand {
    justify-self: start;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
    text-decoration: none;
    white-space: nowrap;
}

.topbar-nav {
    justify-self: center;
    display: flex;
    align-items: center;
    gap: 28px;
}

/* Text-only nav buttons: no background at all */
.topbar-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 2px;
    background: none;
    background-color: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s ease;
}

.topbar-link:hover {
    background: none;
    border: none;
    box-shadow: none;
    color: var(--accent-strong);
}

.topbar-link.active {
    background: none;
    border: none;
    box-shadow: none;
    color: var(--accent-strong);
}

html[data-theme="dark"] .topbar-link:hover,
html[data-theme="dark"] .topbar-link.active {
    color: var(--accent);
}

.topbar-right {
    justify-self: end;
    display: flex;
    align-items: center;
}

/* === Theme toggle switch: left = light, right = dark === */
.theme-switch {
    position: relative;
    width: 88px;
    height: 38px;
    flex-shrink: 0;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 11px;
    transition: background 0.25s ease, border-color 0.25s ease;
    font-family: inherit;
}

html[data-theme="dark"] .theme-switch {
    background: #202624;
    border-color: var(--border);
}

.switch-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    z-index: 1;
    transition: color 0.25s ease;
}

.switch-knob {
    position: absolute;
    top: 3px;
    left: 4px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--accent-soft);
    border: 1px solid var(--accent-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px var(--accent-glow);
    transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), background 0.25s ease;
}

/* light: knob left, sun highlighted */
html[data-theme="light"] .switch-sun { color: var(--accent-strong); }
html[data-theme="light"] .switch-knob { transform: translateX(0); }

/* dark: knob right, moon highlighted */
html[data-theme="dark"] .switch-moon { color: var(--accent); }
html[data-theme="dark"] .switch-knob { transform: translateX(48px); }

.theme-switch:hover {
    border-color: var(--accent-border);
}

/* === Generic sliders use accent === */
button { font-family: inherit; }

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 999px;
    background: linear-gradient(to right, var(--accent) 0%, var(--accent) var(--range-fill, 50%), var(--surface-2) var(--range-fill, 50%));
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    margin-top: -8px;
    border-radius: 50%;
    background: var(--accent-soft);
    border: 1px solid var(--accent-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px var(--accent-glow);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.1);
}

input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 999px;
    background: var(--surface-2);
}

input[type="range"]::-moz-range-progress {
    height: 6px;
    border-radius: 999px;
    background: var(--accent);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-soft);
    border: 1px solid var(--accent-border);
    box-shadow: 0 2px 10px var(--accent-glow);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb:hover {
    background: var(--accent-hover);
}

/* === Main === */
.main {
    flex: 1;
    min-height: 100vh;
    overflow-y: auto;
    scrollbar-gutter: stable;
    padding-top: 64px;
}

@supports not (scrollbar-gutter: stable) {
    .main { overflow-y: scroll; }
}

.page {
    display: none;
    min-height: calc(100vh - 64px);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.page-active { display: block; }

/* === Idea page: centered title + textbox, smooth short rise on results === */
.idea-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    min-height: calc(100vh - 64px);
    padding: 28vh 20px 48px;
    transition: padding 0.35s ease;
}

.idea-center.has-results { padding-top: 40px; }

.idea-center-inner {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.title {
    font-size: 42px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
    text-align: center;
    transition: font-size 0.35s ease, margin 0.35s ease;
}

.idea-center.has-results .title {
    font-size: 30px;
    margin-bottom: 16px;
}

/* === Search: distinct blurred textbox, no glow, no border-window === */
.search-wrapper {
    position: relative;
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid var(--search-border);
    border-radius: 20px;
    background: var(--search-bg);
    backdrop-filter: blur(16px) saturate(1.3);
    -webkit-backdrop-filter: blur(16px) saturate(1.3);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.08);
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

html[data-theme="dark"] .search-wrapper {
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
}

.search-box {
    position: relative;
    z-index: 1;
    background: transparent;
    border: none;
    border-radius: 20px;
    padding: 8px;
    display: flex;
    gap: 10px;
    overflow: hidden;
}

.search-input {
    flex: 1;
    min-width: 0;
    border: none;
    background: transparent;
    padding: 18px 24px;
    font-size: 22px;
    color: var(--text-primary);
    outline: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
}

.search-input::placeholder {
    color: var(--text-placeholder);
    opacity: 1;
}

/* Submit button: text-only accent, no background */
.analyze-btn {
    padding: 16px 24px;
    border: none;
    border-radius: 0;
    background: none;
    background-color: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    color: var(--accent-strong);
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.2s ease, transform 0.2s ease;
    white-space: nowrap;
}

html[data-theme="dark"] .analyze-btn { color: var(--accent); }

.analyze-btn:hover {
    background: none;
    box-shadow: none;
    color: var(--accent-strong);
    filter: brightness(1.15);
    transform: none;
}

html[data-theme="dark"] .analyze-btn:hover { color: #bbf7d0; }

.analyze-btn:active { transform: scale(0.98); }

/* Inline hint below the box (replaces browser alert) */
.idea-hint {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    min-height: 26px;
    padding-top: 8px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    color: var(--danger);
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.idea-hint.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Results */
.results-content {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-primary);
    padding: 0 4px 32px;
    text-align: left;
}

.results-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin-top: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.results-content h3:first-child { margin-top: 0; }
.results-content p { margin-bottom: 10px; color: var(--text-secondary); }
.results-content ul { margin: 0 0 15px 20px; padding: 0; list-style: disc; }
.results-content li { margin-bottom: 8px; padding-left: 5px; }
.results-content strong { font-weight: 600; color: var(--text-primary); }

.result-cards-grid {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    grid-auto-rows: auto !important;
    gap: 10px !important;
    margin: 8px 0 16px 0 !important;
    width: 100% !important;
}

.result-cards-grid .result-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
    margin: 0 !important;
    width: auto !important;
    min-width: 0;
}

.result-card-header { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 6px; }
.result-card-title { font-size: 14px; font-weight: 600; color: var(--text-primary); line-height: 1.3; flex: 1; }

.result-card-badge {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-ink);
    background: var(--accent-soft);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--accent-border);
    padding: 2px 7px;
    border-radius: 8px;
    white-space: nowrap;
    flex-shrink: 0;
}

html[data-theme="dark"] .result-card-badge { color: #e8fdf0; }
.result-card p { font-size: 13px; color: var(--text-muted); margin: 0 !important; line-height: 1.4; }

/* === AI analysis: plain page flow below textbox, auto-growing height === */
.results-flow {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    text-align: left;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
}

.results-flow.visible {
    opacity: 1;
    transform: translateY(0);
    margin-top: 28px;
    pointer-events: auto;
}

.results-flow:empty {
    margin-top: 0;
}

.loading {
    font-size: 18px;
    color: var(--text-muted);
    text-align: center;
    padding: 20px;
    animation: pulse 1.5s ease-in-out infinite;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

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

/* === Archive === */
.archive-header { margin-bottom: 32px; }
.archive-title { font-size: 32px; font-weight: 600; color: var(--text-primary); margin-bottom: 12px; }
.section-label { font-size: 14px; font-weight: 500; color: var(--text-muted); }
.archive-empty, .archive-error {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 15px;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    animation: fadeSlideIn 0.6s ease;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    cursor: default;
    transition: box-shadow 0.3s ease, transform 0.2s ease, background 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow), 0 4px 20px var(--accent-glow);
    transform: translateY(-2px);
    border-color: var(--accent-border);
}

.card-header { width: 100%; height: 180px; position: relative; overflow: hidden; }
.card-header::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.15;
    background:
        radial-gradient(circle at 20% 30%, currentColor 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, currentColor 0%, transparent 50%);
}
.card-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(to top, var(--card-bg), transparent);
}

.card-header-0 { background: linear-gradient(135deg, #1a73e8 0%, #4fc3f7 100%); color: #1a73e8; }
.card-header-1 { background: linear-gradient(135deg, #7c4dff 0%, #b388ff 100%); color: #7c4dff; }
.card-header-2 { background: linear-gradient(135deg, #16a34a 0%, #86efac 100%); color: #15803d; }
.card-header-3 { background: linear-gradient(135deg, #f4511e 0%, #ffab91 100%); color: #f4511e; }
.card-header-4 { background: linear-gradient(135deg, #c2185b 0%, #f48fb1 100%); color: #c2185b; }
.card-header-5 { background: linear-gradient(135deg, #039be5 0%, #81d4fa 100%); color: #039be5; }

.card-icon { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -60%); font-size: 48px; opacity: 0.3; z-index: 1; }
.card-body { padding: 16px 18px 18px; }
.card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.card-meta { display: flex; flex-direction: column; gap: 6px; }
.card-meta-row { font-size: 13px; color: var(--text-muted); line-height: 1.4; }
.card-meta-label { color: var(--text-muted); }
.card-meta-value { color: var(--text-secondary); font-weight: 400; }
.card-footer { display: flex; justify-content: space-between; align-items: center; padding: 10px 18px; border-top: 1px solid var(--card-footer-border); }
.card-year { font-size: 13px; color: var(--text-muted); }
.card-team {
    font-size: 12px;
    color: var(--text-primary);
    background: var(--accent-soft);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--accent-border);
    padding: 3px 10px;
    border-radius: 12px;
}

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

/* === Tablets === */
@media (max-width: 1100px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
    .title { font-size: 34px; }
    .search-input { font-size: 19px; padding: 16px 18px; }
    .analyze-btn { padding: 14px 18px; font-size: 15px; }
    .topbar-nav { gap: 20px; }
}

/* === Phones / small tablets === */
@media (max-width: 768px) {
    body { --grid-size: 44px; }
    .topbar {
        height: auto;
        min-height: 60px;
        padding: 8px 12px;
        grid-template-columns: auto 1fr auto;
        gap: 8px;
    }
    .topbar-brand { font-size: 15px; }
    .topbar-nav { gap: 14px; }
    .topbar-link { font-size: 13px; }
    .topbar-link svg { width: 14px; height: 14px; }
    .theme-switch { width: 80px; height: 34px; padding: 0 10px; }
    .switch-knob { width: 26px; height: 26px; }
    html[data-theme="dark"] .switch-knob { transform: translateX(44px); }

    .main { padding-top: 70px; }
    .page { padding: 0px 16px; min-height: calc(100vh - 89px); }
    .cards-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .archive-title { font-size: 24px; }
    .section-label { font-size: 13px; }
    .idea-center { min-height: calc(100vh - 89px); padding: 20vh 8px 32px; }
    .idea-center.has-results { padding-top: 24px; }
}

@media (max-width: 640px) {
    .cards-grid { grid-template-columns: 1fr; }
    .result-cards-grid { grid-template-columns: 1fr !important; }
}

@media (max-width: 600px) {
    .topbar { grid-template-columns: 1fr auto; grid-template-rows: auto auto; }
    .topbar-brand { grid-column: 1; grid-row: 1; }
    .topbar-right { grid-column: 2; grid-row: 1; }
    .topbar-nav { grid-column: 1 / -1; grid-row: 2; justify-content: center; padding-bottom: 2px; }
    .main { padding-top: 104px; }
    .title { font-size: 28px; }
    .search-input { font-size: 16px; padding: 14px 16px; }
    .analyze-btn { padding: 14px 14px; font-size: 14px; flex-shrink: 0; }
    .results-content h3 { font-size: 18px; }
    .results-content { font-size: 15px; padding: 0 2px 24px; }
    .results-content ul { margin-left: 15px; }
    .card-header { height: 140px; }
    .card-title { font-size: 14px; }
}

@media (max-width: 380px) {
    .search-box { flex-wrap: wrap; }
    .search-input { width: 100%; text-align: center; }
    .analyze-btn { width: 100%; text-align: center; }
}

@media (max-width: 480px) {
    .analyze-btn span { display: none; }
    .analyze-btn::after { content: '→'; font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
    .idea-center, .results-flow, .title { transition: none; }
}