/* ========================================================================
   FocusBuddy — 디자인 시스템
   방향: Soft + 약간 게임화. 슬레이트 다크 + 앰버 단일 액센트.
   타이포: Pretendard (한글-친화 가변 폰트)
   ======================================================================== */

@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css");

:root {
    /* surface */
    --bg:           #0B1120;
    --bg-elev:      #131C2E;
    --bg-card:      #1A2538;
    --bg-card-hi:   #233149;
    --border:       rgba(255, 255, 255, 0.08);
    --border-hi:    rgba(255, 255, 255, 0.16);

    /* text */
    --text:         #F8FAFC;
    --text-muted:   #94A3B8;
    --text-dim:     #64748B;

    /* accent */
    --amber:        #FBBF24;
    --amber-hi:     #FCD34D;
    --amber-soft:   rgba(251, 191, 36, 0.12);
    --amber-glow:   rgba(251, 191, 36, 0.28);

    /* signals */
    --ok:           #34D399;
    --warn:         #F87171;

    /* rhythm */
    --r-1:  4px;
    --r-2:  8px;
    --r-3:  16px;
    --r-4:  24px;
    --r-5:  40px;
    --r-6:  64px;
    --r-7:  96px;
    --r-8:  128px;

    /* radius */
    --rad-sm: 8px;
    --rad:    16px;
    --rad-lg: 28px;
    --rad-pill: 999px;

    /* type */
    --font: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", system-ui, sans-serif;
    --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
    font-feature-settings: "ss01", "ss02";
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* atmospheric background — radial mesh */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(60% 50% at 80% 0%, rgba(251, 191, 36, 0.10), transparent 65%),
        radial-gradient(50% 40% at 10% 30%, rgba(52, 211, 153, 0.06), transparent 70%),
        radial-gradient(70% 60% at 50% 100%, rgba(99, 102, 241, 0.06), transparent 70%);
    pointer-events: none;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
ul { list-style: none; }

/* ========== Layout ========== */

.shell {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 var(--r-4);
}

.section {
    padding: var(--r-7) 0;
}

@media (max-width: 640px) {
    .section { padding: var(--r-6) 0; }
    .shell { padding: 0 var(--r-3); }
}

/* ========== Nav ========== */

.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    background: rgba(11, 17, 32, 0.72);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex; align-items: center; gap: 10px;
    font-weight: 800; font-size: 18px; letter-spacing: -0.02em;
}

.logo-mark {
    width: 30px; height: 30px;
    border-radius: 9px;
    background: linear-gradient(135deg, var(--amber) 0%, var(--amber-hi) 100%);
    display: grid; place-items: center;
    color: #0B1120; font-weight: 900;
    box-shadow: 0 6px 20px -8px var(--amber-glow);
}

.nav a.nav-link {
    color: var(--text-muted);
    font-size: 14px;
    margin-right: var(--r-3);
    transition: color .15s ease;
}
.nav a.nav-link:hover { color: var(--text); }

/* ========== Hero ========== */

.hero {
    padding-top: var(--r-7);
    padding-bottom: var(--r-8);
    position: relative;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: var(--r-6);
    align-items: center;
}

.eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 12px;
    border-radius: var(--rad-pill);
    background: var(--amber-soft);
    color: var(--amber-hi);
    font-size: 12px; font-weight: 600;
    letter-spacing: 0.02em;
    border: 1px solid rgba(251, 191, 36, 0.22);
}

.eyebrow .dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--amber);
    box-shadow: 0 0 0 4px rgba(251, 191, 36, 0.20);
}

.hero h1 {
    font-size: clamp(38px, 5.5vw, 68px);
    line-height: 1.05;
    letter-spacing: -0.035em;
    font-weight: 900;
    margin-top: var(--r-3);
}

.hero h1 .accent {
    color: var(--amber);
    background: linear-gradient(180deg, var(--amber-hi), var(--amber) 70%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p.lede {
    color: var(--text-muted);
    font-size: clamp(16px, 1.35vw, 18px);
    max-width: 520px;
    margin-top: var(--r-4);
}

.hero-cta {
    margin-top: var(--r-5);
    display: flex; flex-wrap: wrap; gap: 12px;
    align-items: center;
}

.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 22px;
    border-radius: var(--rad-pill);
    font-weight: 700;
    font-size: 15px;
    transition: transform .12s ease, box-shadow .15s ease, background .15s ease;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(180deg, var(--amber-hi), var(--amber));
    color: #0B1120;
    box-shadow: 0 12px 30px -10px var(--amber-glow), inset 0 -2px 0 rgba(0,0,0,0.15);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 18px 36px -10px var(--amber-glow); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
    background: var(--bg-card);
    border: 1px solid var(--border-hi);
    color: var(--text);
}
.btn-ghost:hover { background: var(--bg-card-hi); }

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

/* hero phone mock */
.phone-stage {
    position: relative;
    aspect-ratio: 0.62;
    max-height: 560px;
    margin-left: auto;
    perspective: 1400px;
}

.phone {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, #1F2A3F 0%, #0F1827 100%);
    border-radius: 38px;
    border: 1px solid var(--border-hi);
    box-shadow:
        0 40px 80px -30px rgba(0, 0, 0, 0.7),
        0 12px 30px -10px rgba(251, 191, 36, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    padding: 18px;
    transform: rotate(-3deg);
    overflow: hidden;
}
.phone::before {
    content: "";
    position: absolute;
    top: 14px; left: 50%; transform: translateX(-50%);
    width: 110px; height: 26px;
    background: #000;
    border-radius: 14px;
}

.phone-screen {
    background: var(--bg);
    border-radius: 24px;
    height: 100%;
    padding: 60px 22px 22px;
    display: flex; flex-direction: column;
    gap: 14px;
}

.phone-mini-eyebrow {
    font-size: 11px;
    color: var(--text-dim);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.timer-big {
    font-family: var(--font-mono);
    font-size: 64px;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
    color: var(--text);
}

.timer-label {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: -4px;
}

.timer-bar {
    height: 6px;
    border-radius: 999px;
    background: var(--bg-card);
    overflow: hidden;
    margin-top: var(--r-3);
}
.timer-bar > span {
    display: block;
    height: 100%;
    width: 64%;
    background: linear-gradient(90deg, var(--amber), var(--amber-hi));
    border-radius: 999px;
}

.streak-row {
    margin-top: auto;
    display: flex; align-items: center; gap: 10px;
}
.chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 10px;
    border-radius: var(--rad-pill);
    background: var(--bg-card);
    color: var(--text-muted);
    font-size: 12px; font-weight: 600;
}
.chip.ok { color: var(--ok); background: rgba(52, 211, 153, 0.10); }

/* floating notification pill */
.notif-pill {
    position: absolute;
    right: -28px;
    top: 38%;
    background: var(--bg-card-hi);
    border: 1px solid var(--border-hi);
    border-radius: 18px;
    padding: 14px 18px;
    box-shadow: 0 24px 40px -20px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(251, 191, 36, 0.06);
    transform: rotate(4deg);
    min-width: 220px;
    z-index: 2;
}
.notif-pill .notif-h {
    display: flex; align-items: center; gap: 8px;
    font-size: 11px; color: var(--text-dim);
    letter-spacing: 0.05em; text-transform: uppercase;
    margin-bottom: 6px;
}
.notif-pill .notif-h .dot {
    width: 6px; height: 6px; border-radius: 50%; background: var(--amber);
}
.notif-pill .notif-big {
    font-size: 22px; font-weight: 800; letter-spacing: -0.02em;
}
.notif-pill ul {
    margin-top: 10px;
    display: flex; flex-direction: column; gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}
.notif-pill ul li {
    display: flex; justify-content: space-between;
}
.notif-pill ul li b { color: var(--text); font-weight: 600; }

/* hero entrance animation */
.fade-in     { opacity: 0; transform: translateY(16px); animation: fadeUp .8s .05s ease forwards; }
.slide-right { opacity: 0; transform: translateX(28px) rotate(-3deg); animation: slideR .9s .25s cubic-bezier(.2,.8,.25,1) forwards; }
.drop-in     { opacity: 0; transform: translateY(-12px) rotate(4deg); animation: dropIn .7s .55s cubic-bezier(.2,.8,.25,1) forwards; }

@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }
@keyframes slideR { to { opacity: 1; transform: translateX(0) rotate(-3deg); } }
@keyframes dropIn { to { opacity: 1; transform: translateY(0) rotate(4deg); } }

/* ========== Section: 어떻게 작동해 ========== */

.h2 {
    font-size: clamp(28px, 3vw, 40px);
    line-height: 1.15;
    letter-spacing: -0.025em;
    font-weight: 800;
}
.h2 .amber { color: var(--amber); }
.h2-sub {
    color: var(--text-muted);
    margin-top: 12px;
    font-size: 16px;
    max-width: 540px;
}

.steps {
    margin-top: var(--r-5);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--r-3);
}
.step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--rad-lg);
    padding: var(--r-4);
    position: relative;
    overflow: hidden;
}
.step .num {
    font-family: var(--font-mono);
    font-size: 56px;
    font-weight: 800;
    color: var(--amber);
    line-height: 1;
    letter-spacing: -0.04em;
}
.step h3 {
    margin-top: var(--r-3);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.step p {
    margin-top: 10px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ========== 비교 — 왜 다른가 ========== */

.compare {
    margin-top: var(--r-5);
    border: 1px solid var(--border);
    border-radius: var(--rad-lg);
    overflow: hidden;
    background: var(--bg-elev);
}
.compare-head, .compare-row {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    align-items: center;
}
.compare-head {
    padding: 14px var(--r-4);
    font-size: 13px;
    color: var(--text-dim);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}
.compare-row {
    padding: 18px var(--r-4);
    border-top: 1px solid var(--border);
    font-size: 15px;
}
.compare-row:first-of-type { border-top: 0; }
.compare-row > .cell { color: var(--text-muted); }
.compare-row > .feat { color: var(--text); font-weight: 600; }
.compare-row > .cell.ok::before  { content: "●"; color: var(--ok); margin-right: 6px; }
.compare-row > .cell.no::before  { content: "○"; color: var(--text-dim); margin-right: 6px; }
.compare-row > .cell.fb { color: var(--amber); font-weight: 700; }

.compare-row.highlight {
    background: linear-gradient(90deg, rgba(251, 191, 36, 0.05), transparent 80%);
}

/* ========== Privacy promise — 한 문장 강조 ========== */

.promise {
    text-align: left;
    padding: var(--r-7) 0;
    background:
        radial-gradient(60% 100% at 0% 50%, rgba(52, 211, 153, 0.08), transparent 70%);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.promise .h2 {
    max-width: 880px;
}
.promise .h2 mark {
    background: var(--amber-soft);
    color: var(--amber-hi);
    padding: 0 6px;
    border-radius: 4px;
}
.promise ul {
    margin-top: var(--r-4);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--r-3);
}
.promise li {
    border-left: 2px solid var(--amber);
    padding-left: 14px;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.5;
}
.promise li b { display: block; color: var(--text); margin-bottom: 4px; font-weight: 700; }

/* ========== Download CTA ========== */

.download {
    text-align: center;
    padding: var(--r-7) 0 var(--r-8);
}
.download .h2 { font-size: clamp(32px, 4vw, 52px); }
.download .meta {
    margin-top: var(--r-4);
    color: var(--text-dim);
    font-size: 13px;
    display: flex; gap: var(--r-3); justify-content: center; flex-wrap: wrap;
}
.download .meta b { color: var(--text-muted); font-weight: 600; }
.download .btn-primary { margin-top: var(--r-4); padding: 18px 32px; font-size: 17px; }

.install-steps {
    margin: var(--r-5) auto 0;
    max-width: 560px;
    text-align: left;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--rad-lg);
    padding: var(--r-4);
}
.install-steps h4 {
    font-size: 13px; color: var(--text-dim);
    letter-spacing: 0.06em; text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 12px;
}
.install-steps ol { padding-left: 20px; color: var(--text-muted); font-size: 14px; }
.install-steps ol li { margin-bottom: 8px; line-height: 1.5; }

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

footer {
    border-top: 1px solid var(--border);
    padding: var(--r-5) 0;
    color: var(--text-dim);
    font-size: 13px;
}
footer .row {
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--r-3);
}
footer a { color: var(--text-muted); margin-right: var(--r-3); }
footer a:hover { color: var(--text); }

/* ========== Mobile ========== */

@media (max-width: 880px) {
    .hero-grid { grid-template-columns: 1fr; gap: var(--r-5); }
    .phone-stage { max-width: 320px; max-height: 520px; margin: 0 auto; }
    .notif-pill { right: -12px; min-width: 200px; }
    .steps { grid-template-columns: 1fr; }
    .promise ul { grid-template-columns: 1fr; }
    .compare-head, .compare-row { grid-template-columns: 1.4fr 1fr 1fr 1fr; font-size: 13px; }
    .nav .nav-link { display: none; }
}

/* ========== Admin page ========== */

.admin-shell { padding: var(--r-5) 0; }
.admin-shell h1 {
    font-size: 28px; font-weight: 800; letter-spacing: -0.02em;
    margin-bottom: var(--r-4);
}
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--r-3);
    margin-bottom: var(--r-4);
}
.stat {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--rad);
    padding: var(--r-4);
}
.stat .label { color: var(--text-dim); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.stat .val   { font-family: var(--font-mono); font-size: 32px; font-weight: 800; color: var(--text); margin-top: 6px; letter-spacing: -0.02em; }
.stat .delta { color: var(--ok); font-size: 12px; margin-top: 4px; }

.panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--rad);
    padding: var(--r-4);
    margin-top: var(--r-4);
}
.panel h2 {
    font-size: 16px; font-weight: 700; letter-spacing: -0.01em;
    margin-bottom: var(--r-3);
}
.panel table {
    width: 100%; border-collapse: collapse; font-size: 13px;
}
.panel th, .panel td {
    text-align: left; padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}
.panel th { color: var(--text-dim); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.panel td  { color: var(--text-muted); font-family: var(--font-mono); }
.panel td.f { font-family: var(--font); color: var(--text); }
.tag {
    display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px;
}
.tag.ok    { background: rgba(52, 211, 153, 0.12); color: var(--ok); }
.tag.fail  { background: rgba(248, 113, 113, 0.12); color: var(--warn); }