/* ==========================================================================
   练了么 — /certification
   A three-step operator flow: identify, measure, certify. The candidate should
   feel like they are being coached, not audited.
   ========================================================================== */

.cert-shell {
    width: 100%;
    max-width: 1080px;
    margin-inline: auto;
    padding: clamp(18px, 2.6vw, 30px) clamp(16px, 3vw, 28px) clamp(40px, 5vw, 72px);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cert-intro h2 {
    font-size: clamp(23px, 2.8vw, 31px);
    font-weight: 700;
    letter-spacing: -0.034em;
}

.cert-intro p {
    margin-top: 9px;
    font-size: 14.5px;
    line-height: 1.7;
    color: var(--text-2);
    max-width: 78ch;
}

/* --------------------------------------------------------------------------
   Stepper
   -------------------------------------------------------------------------- */
.stepper {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    padding: 14px 16px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-xl);
    box-shadow: var(--sh-sm);
}

.stepper-item {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    position: relative;
    padding-right: 12px;
}

.stepper-item + .stepper-item::before {
    content: "";
    position: absolute;
    left: -6px;
    top: 50%;
    width: 1px;
    height: 26px;
    transform: translateY(-50%);
    background: var(--line-strong);
}

.stepper-dot {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--surface-2);
    border: 1px solid var(--line-strong);
    color: var(--text-4);
    font-size: 11.5px;
    font-weight: 680;
    font-variant-numeric: tabular-nums;
    transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
        color var(--t) var(--ease), box-shadow var(--t) var(--ease);
    flex: none;
}

.stepper-item b {
    display: block;
    font-size: 13.5px;
    font-weight: 620;
    letter-spacing: -0.016em;
    color: var(--text-3);
    transition: color var(--t) var(--ease);
}

.stepper-item span {
    display: block;
    font-size: 11.5px;
    color: var(--text-4);
    line-height: 1.4;
}

.stepper-item.active .stepper-dot {
    background: var(--b-500);
    border-color: var(--b-600);
    color: #fff;
    box-shadow: 0 0 0 4px var(--b-50);
}

.stepper-item.active b {
    color: var(--text);
}

.stepper-item.done .stepper-dot {
    background: var(--g-500);
    border-color: var(--g-600);
    color: #fff;
}

.stepper-item.done b {
    color: var(--text-2);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
    padding: clamp(20px, 2.6vw, 28px);
}

.step-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 24px;
    padding: 0 11px;
    border-radius: var(--r-full);
    background: var(--accent-soft);
    border: 1px solid var(--accent-line);
    color: var(--b-700);
    font-size: 11px;
    font-weight: 640;
    letter-spacing: 0.055em;
}

.card-title {
    margin: 14px 0 0;
    font-size: 20px;
    font-weight: 680;
    letter-spacing: -0.028em;
}

.card-desc {
    margin: 7px 0 0;
    font-size: 13.5px;
    line-height: 1.65;
    color: var(--text-2);
    max-width: 74ch;
}

.hint {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-top: 14px;
    padding: 11px 13px;
    border-radius: var(--r-md);
    background: var(--surface-2);
    border: 1px solid var(--line);
    font-size: 12.5px;
    line-height: 1.6;
    color: var(--text-2);
}

.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin-top: 20px;
}

/* --------------------------------------------------------------------------
   Step 1 — identity + item picker
   -------------------------------------------------------------------------- */
.field-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 20px;
}

.pick-label {
    margin-top: 20px;
}

.pick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 10px;
    margin-top: 8px;
}

.pick {
    position: relative;
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 12px;
    align-items: center;
    padding: 14px 16px;
    text-align: left;
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-lg);
    box-shadow: var(--sh-xs);
    cursor: pointer;
    transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
        background var(--t) var(--ease), transform var(--t-fast) var(--ease);
}

.pick:hover {
    border-color: var(--b-300);
    box-shadow: var(--sh-md);
}

.pick:active {
    transform: translateY(1px);
}

.pick-icon {
    width: 38px;
    height: 38px;
    border-radius: 11px;
    display: grid;
    place-items: center;
    background: var(--surface-2);
    border: 1px solid var(--line);
    color: var(--text-3);
    transition: background var(--t) var(--ease), color var(--t) var(--ease),
        border-color var(--t) var(--ease);
}

.pick-text {
    min-width: 0;
}

.pick-text b {
    display: block;
    font-size: 14.5px;
    font-weight: 640;
    letter-spacing: -0.018em;
    color: var(--text);
}

.pick-text span {
    display: block;
    font-size: 12px;
    color: var(--text-3);
    line-height: 1.45;
}

.pick .tick {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--b-500);
    color: #fff;
    opacity: 0;
    transform: scale(0.6);
    transition: opacity var(--t) var(--ease), transform var(--t) var(--spring);
}

.pick.on {
    border-color: var(--b-400);
    background: linear-gradient(160deg, var(--b-50), var(--surface) 72%);
    box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.14), var(--sh-sm);
}

.pick.on .pick-icon {
    background: var(--b-500);
    border-color: var(--b-600);
    color: #fff;
}

.pick.on .tick {
    opacity: 1;
    transform: none;
}

/* --------------------------------------------------------------------------
   Step 2 — detection stage
   -------------------------------------------------------------------------- */
.video-box {
    aspect-ratio: 16 / 9;
    width: 100%;
    margin-top: 20px;
}

.progress-panel {
    padding: 14px 16px 15px;
    border-radius: var(--r-lg);
    background: rgba(9, 17, 28, 0.66);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    backdrop-filter: blur(14px) saturate(160%);
    border: 1px solid rgba(148, 174, 214, 0.18);
    color: var(--stage-text);
}

.progress-panel .row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
}

.count {
    font-size: clamp(30px, 3.6vw, 40px);
    font-weight: 700;
    letter-spacing: -0.045em;
    line-height: 1.02;
    color: #fff;
    font-variant-numeric: tabular-nums;
}

.count em {
    font-style: normal;
    font-size: 0.44em;
    font-weight: 620;
    letter-spacing: -0.01em;
    color: rgba(215, 227, 245, 0.62);
}

.phase {
    font-size: 12.5px;
    font-weight: 560;
    color: rgba(215, 227, 245, 0.66);
}

.progress-track {
    position: relative;
    height: 6px;
    margin-top: 11px;
    border-radius: var(--r-full);
    background: rgba(148, 174, 214, 0.2);
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    inset: 0 auto 0 0;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--b-400), var(--g-400));
    box-shadow: 0 0 14px rgba(31, 198, 137, 0.55);
    transition: width var(--t-slow) var(--ease-out);
}

.cue-line {
    margin-top: 11px;
    font-size: 13.5px;
    font-weight: 560;
    line-height: 1.5;
    color: var(--stage-text);
}

/* Circular target readout — the "how far to 50" glance */
.ring {
    position: relative;
    width: 92px;
    height: 92px;
    flex: none;
}

.ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.ring .ring-bg {
    fill: none;
    stroke: rgba(148, 174, 214, 0.22);
    stroke-width: 7;
}

.ring .ring-fg {
    fill: none;
    stroke: url(#ringGrad);
    stroke-width: 7;
    stroke-linecap: round;
    stroke-dasharray: 245;
    stroke-dashoffset: 245;
    transition: stroke-dashoffset var(--t-slow) var(--ease-out);
    filter: drop-shadow(0 0 6px rgba(31, 198, 137, 0.6));
}

.ring-label {
    position: absolute;
    inset: 0;
    display: grid;
    place-content: center;
    text-align: center;
}

.ring-label b {
    display: block;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: #fff;
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}

.ring-label span {
    display: block;
    font-size: 9.5px;
    font-weight: 620;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: rgba(215, 227, 245, 0.62);
}

/* --------------------------------------------------------------------------
   Step 3 — result + certificate
   -------------------------------------------------------------------------- */
.result-panel {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-top: 16px;
}

.result-head {
    display: flex;
    align-items: center;
    gap: 16px;
}

.result-icon {
    width: 60px;
    height: 60px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    font-size: 28px;
    background: var(--surface-2);
    border: 1px solid var(--line-strong);
    flex: none;
}

.result-icon.pass {
    background: linear-gradient(160deg, var(--g-100), var(--g-50));
    border-color: var(--g-300);
    box-shadow: 0 0 0 5px var(--g-50);
}

.result-icon.fail {
    background: linear-gradient(160deg, var(--w-100), var(--w-50));
    border-color: var(--w-300);
    box-shadow: 0 0 0 5px var(--w-50);
}

.result-head h2 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.result-head p {
    margin-top: 5px;
    font-size: 13.5px;
    line-height: 1.6;
    color: var(--text-2);
}

.cert-frame {
    padding: 14px;
    border-radius: var(--r-2xl);
    background: linear-gradient(160deg, var(--surface-2), var(--surface));
    border: 1px solid var(--line);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.cert-canvas {
    width: 100%;
    height: auto;
    border-radius: var(--r-md);
    background: #fff;
    box-shadow: var(--sh-lg);
}

/* --------------------------------------------------------------------------
   Records
   -------------------------------------------------------------------------- */
.history-table td:nth-child(4),
.history-table th:nth-child(4) {
    font-variant-numeric: tabular-nums;
}

.history-table td:nth-child(5) {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-3);
}

.history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 34px 20px;
    text-align: center;
    font-size: 13.5px;
    color: var(--text-3);
}

.history-empty svg {
    color: var(--text-4);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 760px) {
    .field-row {
        grid-template-columns: minmax(0, 1fr);
    }

    .stepper {
        grid-template-columns: minmax(0, 1fr);
        gap: 12px;
    }

    .stepper-item + .stepper-item::before {
        display: none;
    }

    .video-box {
        aspect-ratio: 4 / 3;
    }

    .progress-panel .row {
        align-items: center;
    }

    .ring {
        width: 74px;
        height: 74px;
    }

    .btn-row .btn {
        flex: 1 1 100%;
    }
}