:root {
    --ink: #20242a;
    --muted: #66717c;
    --line: #d9e0e7;
    --panel: #ffffff;
    --page: #f5f7fa;
    --green: #1b7f5f;
    --green-dark: #145b47;
    --orange: #d36a3d;
    --red: #b42318;
    --steel: #40515f;
    --soft-green: #e8f4ef;
    --soft-orange: #fff1e8;
    --shadow: 0 10px 24px rgba(25, 33, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--page);
    color: var(--ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 15px;
    line-height: 1.5;
}

a {
    color: var(--green);
    text-decoration: none;
}

a:hover {
    color: var(--green-dark);
}

button,
input,
textarea,
select {
    font: inherit;
}

input,
textarea,
select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
    outline: none;
}

input,
select {
    min-height: 42px;
    padding: 0 12px;
}

textarea {
    padding: 12px;
    resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(27, 127, 95, 0.14);
}

.site-header {
    min-height: 66px;
    padding: 10px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 20;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    font-size: 18px;
    letter-spacing: 0;
}

.brand small {
    color: var(--muted);
    font-size: 12px;
    margin-top: -2px;
}

.top-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.top-nav a {
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    padding: 0 12px;
    border-radius: 8px;
    color: var(--steel);
}

.top-nav a:hover,
.top-nav .nav-strong {
    background: var(--ink);
    color: #fff;
}

.flash-wrap {
    max-width: 1180px;
    margin: 16px auto 0;
    padding: 0 24px;
}

.flash {
    border: 1px solid var(--line);
    border-left: 4px solid var(--green);
    border-radius: 8px;
    background: #fff;
    padding: 12px 14px;
    box-shadow: var(--shadow);
}

.flash-danger {
    border-left-color: var(--red);
}

.flash-warning {
    border-left-color: var(--orange);
}

.auth-shell {
    max-width: 1060px;
    margin: 54px auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.75fr);
    gap: 18px;
}

.auth-panel,
.empty-state,
.session-card,
.stage-editor,
.log-section,
.prompt-panel,
.stage-rail {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.auth-panel {
    padding: 28px;
}

.product-panel {
    background:
        linear-gradient(135deg, rgba(27, 127, 95, 0.1), transparent 42%),
        linear-gradient(315deg, rgba(211, 106, 61, 0.16), transparent 38%),
        #fff;
}

.panel-kicker,
.eyebrow {
    margin: 0 0 6px;
    color: var(--green);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

h1,
h2 {
    margin: 0;
    letter-spacing: 0;
    line-height: 1.15;
}

.product-panel h1 {
    max-width: 620px;
    font-size: 38px;
}

.product-panel p {
    max-width: 590px;
    color: var(--steel);
    font-size: 17px;
}

.proof-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 28px;
}

.proof-row span,
.status-pill {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 6px 10px;
    background: #fff;
    color: var(--steel);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
}

.stack-form {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}

.stack-form label span,
.editor-label,
.editor-controls label span,
.status-edit span,
.title-edit label {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
}

.switch-line {
    color: var(--muted);
    margin: 16px 0 0;
}

.btn {
    min-height: 42px;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 0 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 800;
    white-space: nowrap;
}

.btn.primary {
    background: var(--green);
    color: #fff;
}

.btn.primary:hover {
    background: var(--green-dark);
    color: #fff;
}

.btn.secondary {
    background: #fff;
    color: var(--ink);
    border-color: var(--line);
}

.btn.secondary:hover {
    background: #f0f4f7;
}

.btn.danger {
    background: #fff;
    color: var(--red);
    border-color: #f0c8c3;
}

.btn.danger:hover {
    background: #fff4f3;
}

.page-shell {
    max-width: 1180px;
    margin: 28px auto 60px;
    padding: 0 24px;
}

.dashboard-top {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.8fr);
    gap: 18px;
    align-items: end;
    margin-bottom: 22px;
}

.dashboard-top h1 {
    font-size: 32px;
}

.quick-create {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
}

.session-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.session-card {
    padding: 18px;
    display: grid;
    gap: 16px;
}

.session-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.session-card h2 {
    margin-top: 10px;
    font-size: 21px;
    overflow-wrap: anywhere;
}

.percent {
    color: var(--green);
    font-size: 24px;
}

.status-active {
    background: var(--soft-green);
    color: var(--green-dark);
}

.status-completed {
    background: #ecfdf3;
    color: #067647;
}

.status-archived {
    background: #eef2f5;
    color: var(--steel);
}

.progress-track {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #e7edf1;
    border: 1px solid #d8e1e7;
}

.progress-track span {
    display: block;
    height: 100%;
    min-width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--green), var(--orange));
    transition: width 220ms ease;
}

.meta-row {
    display: flex;
    gap: 26px;
    margin: 0;
}

.meta-row dt {
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
}

.meta-row dd {
    margin: 2px 0 0;
    font-weight: 800;
}

.card-actions,
.prompt-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.empty-state {
    padding: 34px;
}

.empty-state p {
    color: var(--muted);
}

.workflow-page {
    overflow: hidden;
}

.workflow-shell {
    height: calc(100vh - 66px);
    min-height: 680px;
    display: flex;
    flex-direction: column;
}

.workflow-top {
    display: grid;
    grid-template-columns: minmax(260px, 1fr) 170px 240px;
    gap: 12px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--line);
    background: #fff;
}

.title-edit input {
    font-size: 18px;
    font-weight: 800;
}

.overall-box {
    display: grid;
    gap: 7px;
    align-content: end;
}

.overall-box span:first-child {
    color: var(--green);
    font-weight: 900;
    text-align: right;
}

.workflow-layout {
    flex: 1;
    min-height: 0;
    display: grid;
    grid-template-columns: 292px minmax(0, 1fr) 360px;
    gap: 14px;
    padding: 14px;
}

.stage-rail,
.work-area,
.prompt-panel {
    min-height: 0;
}

.stage-rail,
.prompt-panel {
    overflow: auto;
}

.stage-rail {
    padding: 14px;
}

.rail-head,
.section-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.rail-head h2,
.section-head h2 {
    font-size: 20px;
}

#saveState {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.stage-list {
    display: grid;
    gap: 8px;
}

.stage-button {
    width: 100%;
    min-height: 112px;
    text-align: left;
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
    cursor: pointer;
}

.stage-button:hover,
.stage-button.active {
    border-color: var(--green);
    background: var(--soft-green);
}

.stage-num {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--ink);
    color: #fff;
    font-weight: 900;
}

.stage-button.complete .stage-num {
    background: var(--green);
}

.stage-button h3 {
    margin: 0;
    font-size: 15px;
}

.stage-button p {
    margin: 4px 0 9px;
    color: var(--muted);
    font-size: 12px;
}

.mini-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 42px;
    align-items: center;
    gap: 8px;
}

.mini-row strong {
    color: var(--green-dark);
    font-size: 12px;
    text-align: right;
}

.work-area {
    display: grid;
    grid-template-rows: minmax(360px, 1fr) minmax(250px, 0.82fr);
    gap: 14px;
    overflow: hidden;
}

.stage-editor,
.log-section,
.prompt-panel {
    padding: 16px;
}

.stage-editor,
.log-section {
    min-height: 0;
    overflow: auto;
}

.stage-desc {
    margin: -4px 0 14px;
    color: var(--steel);
}

#stageContent {
    min-height: 260px;
}

.editor-controls {
    margin-top: 12px;
    display: grid;
    grid-template-columns: minmax(180px, 1fr) 58px 180px auto;
    gap: 10px;
    align-items: end;
}

#stageProgressValue {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--green);
    font-weight: 900;
}

.message-list {
    display: grid;
    gap: 10px;
    max-height: 290px;
    overflow: auto;
    padding-right: 4px;
}

.message-item {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    background: #fff;
}

.message-item.ai {
    background: #f7fbf9;
    border-color: #cfe7dc;
}

.message-item.decision {
    background: var(--soft-orange);
    border-color: #f2d0ba;
}

.message-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.message-body {
    margin-top: 6px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.message-form {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr) auto;
    gap: 8px;
    align-items: stretch;
    margin-top: 12px;
}

.message-form textarea {
    min-height: 74px;
}

.prompt-panel {
    display: flex;
    flex-direction: column;
}

#promptPack {
    flex: 1;
    min-height: 360px;
    font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    font-size: 13px;
    line-height: 1.55;
    background: #fbfcfd;
}

.prompt-actions {
    margin-top: 10px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 1120px) {
    .session-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .workflow-page {
        overflow: auto;
    }

    .workflow-shell {
        height: auto;
        min-height: 0;
    }

    .workflow-layout {
        grid-template-columns: 270px minmax(0, 1fr);
    }

    .prompt-panel {
        grid-column: 1 / -1;
        min-height: 420px;
    }
}

@media (max-width: 820px) {
    .site-header,
    .dashboard-top,
    .quick-create,
    .workflow-top,
    .workflow-layout,
    .auth-shell,
    .message-form,
    .editor-controls {
        grid-template-columns: 1fr;
    }

    .site-header {
        align-items: flex-start;
    }

    .top-nav {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .auth-shell {
        margin: 24px auto;
    }

    .product-panel h1 {
        font-size: 30px;
    }

    .session-grid {
        grid-template-columns: 1fr;
    }

    .workflow-layout {
        padding: 10px;
    }

    .stage-rail,
    .prompt-panel,
    .stage-editor,
    .log-section {
        overflow: visible;
    }

    .work-area {
        grid-template-rows: auto;
        overflow: visible;
    }
}