/* Black Hole Explorer - Complete Styling */

.tool-page { padding-top: 0; }

.breadcrumb { padding: 20px 0; font-size: 14px; color: #666; }
.breadcrumb a { color: #666; transition: all 0.3s; }
.breadcrumb a:hover { color: #ea580c; }
.breadcrumb .separator { margin: 0 10px; color: #ddd; }
.breadcrumb .current { color: #333; font-weight: 600; }

.tool-header {
    background: linear-gradient(135deg, #0b0b14 0%, #7c2d12 50%, #ea580c 100%);
    color: white; padding: 60px 20px; text-align: center; position: relative; overflow: hidden;
}
.tool-header::before { content: '🕳️'; position: absolute; font-size: 300px; opacity: 0.07; top: -50px; right: -50px; animation: rotate 20s linear infinite; }
@keyframes rotate { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.tool-header-content { max-width: 800px; margin: 0 auto; position: relative; z-index: 1; }
.tool-icon-large { font-size: 72px; margin-bottom: 20px; animation: bounce 2s ease-in-out infinite; }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.tool-header h1 { font-size: 48px; font-weight: 900; margin-bottom: 15px; text-shadow: 2px 2px 4px rgba(0,0,0,0.2); }
.tool-subtitle { font-size: 20px; opacity: 0.95; margin-bottom: 25px; line-height: 1.6; }
.tool-meta { display: flex; justify-content: center; align-items: center; gap: 15px; flex-wrap: wrap; font-size: 16px; }
.meta-separator { opacity: 0.5; }

.tool-content { padding: 50px 20px 60px; background: #f8f9fa; }
.bh-root { max-width: 1240px; margin: 0 auto; display: flex; flex-direction: column; gap: 22px; }

.card { background: #fff; border-radius: 20px; padding: 22px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.card-head h3 { font-size: 19px; color: #1f2937; margin: 0; }
.card-head h3 small { font-size: 12px; color: #6b7280; font-weight: 600; margin-left: 8px; }
.head-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.muted { color: #6b7280; font-weight: 500; font-size: 12px; }
.lbl { display: block; font-size: 13px; font-weight: 700; color: #374151; margin-bottom: 8px; }
.txt { width: 100%; box-sizing: border-box; padding: 11px 12px; border: 2px solid #e5e7eb; border-radius: 10px; font-size: 14px; font-weight: 600; background: #fff; font-family: inherit; }
.txt:focus { outline: none; border-color: #ea580c; }

.seg { display: inline-flex; background: #f3f4f6; border-radius: 10px; padding: 3px; gap: 3px; flex-wrap: wrap; }
.seg button { flex: 1 1 auto; border: none; background: transparent; padding: 8px 14px; border-radius: 8px; font-weight: 700; font-size: 13px; color: #4b5563; cursor: pointer; transition: all .2s; white-space: nowrap; }
.seg button:hover { color: #ea580c; }
.seg button.active { background: #fff; color: #ea580c; box-shadow: 0 2px 8px rgba(0,0,0,0.12); }

.code-tabs { display: flex; gap: 4px; flex-wrap: wrap; background: #f3f4f6; padding: 3px; border-radius: 10px; }
.code-tabs button { border: none; background: transparent; padding: 8px 14px; border-radius: 8px; font-weight: 700; font-size: 13px; color: #4b5563; cursor: pointer; }
.code-tabs button.active { background: #fff; color: #ea580c; box-shadow: 0 2px 8px rgba(0,0,0,0.12); }
.code-box { width: 100%; box-sizing: border-box; background: #0f172a; color: #e2e8f0; border: none; border-radius: 12px; padding: 16px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; line-height: 1.6; resize: vertical; white-space: pre; overflow: auto; }
.code-foot { display: flex; justify-content: flex-end; gap: 10px; margin-top: 12px; }

.btn { padding: 12px 24px; border-radius: 10px; border: none; cursor: pointer; font-weight: 700; font-size: 14px; transition: all 0.3s; display: inline-flex; align-items: center; justify-content: center; gap: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); font-family: inherit; }
.btn:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.15); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: linear-gradient(135deg, #0b0b14 0%, #9a3412 100%); color: white; }
.btn-ghost { background: white; border: 2px solid rgba(0,0,0,0.1); color: #1f2937; }
.btn-ghost:hover:not(:disabled) { border-color: #ea580c; color: #ea580c; }
.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-xs { padding: 6px 10px; font-size: 12px; border-radius: 8px; box-shadow: none; }
.link-btn { border: none; background: none; color: #ea580c; font-weight: 700; font-size: 13px; cursor: pointer; padding: 0; font-family: inherit; }
.link-btn:hover { text-decoration: underline; }

.bh-toast { position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 30px); background: #111827; color: #fff; padding: 12px 22px; border-radius: 12px; font-weight: 700; font-size: 14px; opacity: 0; pointer-events: none; transition: all .3s; z-index: 9999; max-width: 90vw; text-align: center; }
.bh-toast.show { opacity: 1; transform: translate(-50%, 0); }

.info-box { background: white; border-radius: 20px; padding: 30px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
.info-box h4 { font-size: 20px; margin-bottom: 20px; color: #1f2937; }
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.info-item { background: #fff7ed; border-left: 4px solid #ea580c; padding: 16px; border-radius: 10px; font-size: 14px; line-height: 1.6; color: #374151; }
.seo-content { padding: 50px 20px; background: #fff; }
.content-article { max-width: 900px; margin: 0 auto; }
.content-article h2 { font-size: 28px; margin: 32px 0 14px; color: #1f2937; }
.content-article p { font-size: 16px; line-height: 1.8; color: #4b5563; margin-bottom: 14px; }
.content-article code { background: #f1f5f9; padding: 2px 6px; border-radius: 6px; font-size: 14px; }

@media (max-width: 600px) {
    .tool-header { padding: 40px 16px; }
    .tool-header h1 { font-size: 32px; }
    .tool-subtitle { font-size: 16px; }
    .tool-icon-large { font-size: 56px; }
    .tool-content { padding: 30px 12px 40px; }
    .content-article h2 { font-size: 22px; }
}

.mt { margin-top: 16px; }
.two-col { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 22px; align-items: start; }
.col-stack { display: flex; flex-direction: column; gap: 22px; }
.stage { position: relative; height: clamp(520px, 78vh, 820px); border-radius: 20px; overflow: hidden; background: #000; box-shadow: 0 10px 30px rgba(0,0,0,.3); cursor: grab; touch-action: none; user-select: none; -webkit-user-select: none; }
.stage.grabbing { cursor: grabbing; }
.stage:fullscreen { height: 100vh; border-radius: 0; }
.stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.loader { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; text-align: center; padding: 24px; color: #cbd5e1; font-weight: 700; background: #000; z-index: 6; }
.ui { position: absolute; z-index: 3; cursor: default; }
.ui.top { top: 12px; right: 12px; display: flex; gap: 8px; align-items: center; }
.tb { background: rgba(15,15,25,.72); color: #f1f5f9; border: 1px solid rgba(255,255,255,.18); border-radius: 10px; padding: 8px 14px; font-size: 13.5px; font-weight: 700; cursor: pointer; font-family: inherit; transition: all .15s; }
.tb:hover:not(:disabled) { background: rgba(234,88,12,.75); border-color: #fdba74; }
.tb:disabled { opacity: .4; cursor: default; }
.tb.fall { background: linear-gradient(135deg, #ea580c, #b91c1c); border-color: #fdba74; color: #fff; }
.tb.fall:hover { filter: brightness(1.15); }
.seg-mini { display: inline-flex; border: 1px solid rgba(255,255,255,.18); border-radius: 10px; overflow: hidden; }
.seg-mini button { background: rgba(15,15,25,.72); color: #cbd5e1; border: none; padding: 8px 12px; font-size: 13px; font-weight: 800; cursor: pointer; font-family: inherit; }
.seg-mini button.active { background: #ea580c; color: #fff; }
.readout { top: 12px; left: 12px; background: rgba(15,15,25,.68); border: 1px solid rgba(255,255,255,.14); border-radius: 12px; padding: 9px 13px; color: #e2e8f0; font-size: 13px; max-width: 62%; }
.r-line { line-height: 1.7; }
.r-line b { color: #fff; }
.readout .r-line.warn b, .readout .warn b { color: #fdba74; }
.tour { left: 12px; bottom: 12px; width: min(430px, calc(100% - 24px)); background: rgba(10,10,20,.82); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,.16); border-radius: 16px; padding: 15px 17px; color: #e2e8f0; }
.tour-step { font-size: 11.5px; font-weight: 800; letter-spacing: .6px; text-transform: uppercase; color: #fdba74; }
.tour h3 { margin: 4px 0 6px; font-size: 20px; color: #fff; }
.tour p { margin: 0 0 12px; font-size: 14px; line-height: 1.6; color: #cbd5e1; }
.tour-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.stage.falling .tour { display: none; }
.stage.falling .ui.top { opacity: .6; }
.tags { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
.tag { position: absolute; left: 0; top: 0; font-size: 11.5px; font-weight: 800; color: #fff; background: rgba(0,0,0,.6); border: 1px solid rgba(255,255,255,.4); padding: 3px 9px; border-radius: 999px; white-space: nowrap; will-change: transform; }
.tag.ring { border-color: #fde68a; color: #fde68a; }
.tag.disk { border-color: #fdba74; color: #fdba74; }
.hint { position: absolute; z-index: 2; right: 14px; bottom: 14px; color: rgba(226,232,240,.5); font-size: 12px; font-weight: 600; pointer-events: none; text-align: right; max-width: 40%; }
.blackout { position: absolute; inset: 0; z-index: 5; background: #000; display: flex; align-items: center; justify-content: center; text-align: center; padding: 24px; opacity: 0; pointer-events: none; transition: opacity 1.4s ease; }
.blackout.show { opacity: 1; pointer-events: auto; }
.bo-in { max-width: 460px; color: #e2e8f0; }
.bo-icon { font-size: 54px; }
.bo-in h3 { font-size: 24px; margin: 8px 0; color: #fff; }
.bo-in p { font-size: 15px; line-height: 1.7; color: #94a3b8; margin-bottom: 18px; }
.presets { display: flex; flex-wrap: wrap; gap: 8px; }
.presets button { border: 2px solid #f1f5f9; background: #f9fafb; color: #374151; font-weight: 800; font-size: 12.5px; padding: 7px 14px; border-radius: 999px; cursor: pointer; font-family: inherit; transition: all .15s; }
.presets button:hover { border-color: #ea580c; color: #9a3412; background: #fff7ed; }
.presets button.active { background: #ea580c; border-color: #ea580c; color: #fff; }
.frow { margin-bottom: 12px; }
.frow .lbl b { float: right; color: #ea580c; font-weight: 800; }
.frow input[type="range"] { width: 100%; accent-color: #ea580c; }
.chk { display: flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 700; color: #374151; margin: 10px 0; cursor: pointer; }
.chk input { accent-color: #ea580c; width: 16px; height: 16px; }
.muted-p { font-size: 14px; color: #4b5563; line-height: 1.6; margin: 0 0 12px; }
.sq-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.sq-row button { border: 2px solid #f1f5f9; background: #f9fafb; color: #374151; font-weight: 700; font-size: 13px; padding: 8px 13px; border-radius: 12px; cursor: pointer; font-family: inherit; text-align: left; }
.sq-row button:hover { border-color: #ea580c; background: #fff7ed; }
.sq-row button.active { background: #ea580c; border-color: #ea580c; color: #fff; }
.sq-out { background: #0b0b14; border-radius: 14px; padding: 16px 18px; color: #e2e8f0; }
.sq-need { font-size: 13px; color: #94a3b8; font-weight: 600; }
.sq-val { font-size: 34px; font-weight: 900; color: #fdba74; margin: 4px 0; word-break: break-word; }
.sq-cmp { font-size: 14px; line-height: 1.6; color: #cbd5e1; }
.sq-formula { margin-top: 10px; font-size: 12px; color: #64748b; font-family: ui-monospace, Menlo, Consolas, monospace; }
.quiz-n { font-size: 12px; font-weight: 800; color: #ea580c; letter-spacing: .5px; }
.quiz-q { font-size: 17px; font-weight: 800; color: #1f2937; margin: 6px 0 12px; line-height: 1.4; }
.quiz-opts { display: grid; gap: 8px; }
.opt { text-align: left; border: 2px solid #e5e7eb; background: #fff; border-radius: 12px; padding: 11px 14px; font-size: 14px; font-weight: 600; color: #374151; cursor: pointer; font-family: inherit; transition: all .15s; }
.opt:hover:not(:disabled) { border-color: #ea580c; background: #fff7ed; }
.opt.right { border-color: #16a34a; background: #f0fdf4; color: #166534; }
.opt.wrong { border-color: #dc2626; background: #fef2f2; color: #991b1b; }
.opt:disabled { cursor: default; }
.quiz-fb { margin: 12px 0 10px; font-weight: 800; color: #1f2937; }
.quiz-done { text-align: center; padding: 10px 0; }
.quiz-done .big { font-size: 54px; }
.quiz-done h4 { margin: 8px 0 14px; font-size: 20px; color: #1f2937; }

@media (max-width: 960px) { .two-col { grid-template-columns: 1fr; } }
@media (max-width: 640px) {
    .stage { height: 78vh; min-height: 520px; }
    .tour { bottom: 8px; left: 8px; width: calc(100% - 16px); padding: 12px 14px; }
    .tour h3 { font-size: 17px; }
    .tour p { font-size: 13px; margin-bottom: 10px; }
    .readout { max-width: 60%; font-size: 12px; padding: 7px 10px; }
    .hint { display: none; }
}