/* =====================================================================
   AI Services page — Editorial Ledger system (loaded after ../home/styles.css)
   ===================================================================== */

/* The [hidden] attribute must beat class-based display:flex/grid on states */
[hidden] {
    display: none !important;
}

.ai-page {
    background: var(--bg-white);
    padding: var(--s6) 0 var(--s7);
    min-height: calc(100vh - 52px);
}

.ai-wrap {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--s5) 0 var(--spine);
}

/* --- Intro strip --- */
.ai-intro {
    max-width: 760px;
    padding-left: var(--s4);
    border-left: 2px solid var(--accent-color);
    margin-bottom: var(--s6);
}

.ai-title {
    font-size: var(--fs-h2);
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.12;
    letter-spacing: -0.01em;
    margin: 0 0 var(--s3);
}

.ai-desc {
    font-size: var(--fs-lead);
    color: var(--text-light);
    margin: 0 0 var(--s2);
    max-width: 62ch;
}

.ai-disclaimer {
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
    color: var(--text-light);
    letter-spacing: 0.02em;
    margin: 0;
}

@media (min-width: 900px) {
    .ai-title {
        font-size: var(--fs-h2-lg);
    }
}

/* --- Tool grid --- */
.ai-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-top: 1px solid var(--ink-line-strong);
    border-left: 1px solid var(--ink-line-strong);
    border-bottom: 1px solid var(--ink-line-strong);
    border-right: 1px solid var(--ink-line-strong);
}

.ai-panel {
    padding: var(--s4);
    background: var(--bg-white);
    min-width: 0;
}

.ai-input-panel {
    border-right: 1px solid var(--ink-line-strong);
}

.ai-panel-label {
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
    font-weight: 700;
    letter-spacing: 0.16em;
    color: var(--primary-color);
    margin-bottom: var(--s3);
}

/* --- Input --- */
.ai-textarea {
    width: 100%;
    min-height: 320px;
    resize: vertical;
    border: 1px solid var(--ink-line);
    border-radius: 0;
    padding: var(--s3);
    font-family: inherit;
    font-size: var(--fs-body);
    line-height: 1.7;
    color: var(--text-dark);
    background: var(--bg-light);
    outline: none;
    transition: border-color 0.2s ease;
}

.ai-textarea:focus {
    border-color: var(--primary-color);
    background: var(--bg-white);
}

.ai-input-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s2);
    margin-top: var(--s3);
    flex-wrap: wrap;
}

.ai-count {
    font-family: var(--font-mono);
    font-size: var(--fs-fine);
    color: var(--text-light);
    font-variant-numeric: tabular-nums;
}

.ai-input-actions {
    display: flex;
    gap: var(--s2);
}

/* --- Buttons --- */
.ai-btn {
    font-family: inherit;
    font-size: var(--fs-fine);
    font-weight: 700;
    border-radius: 0;
    padding: 0.7rem 1.5rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.ai-btn-primary {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

.ai-btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.ai-btn-ghost {
    background: transparent;
    color: var(--text-light);
    border-color: var(--ink-line-strong);
}

.ai-btn-ghost:hover:not(:disabled) {
    color: var(--text-dark);
    border-color: var(--text-dark);
}

.ai-btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.ai-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* --- Result states --- */
.ai-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 320px;
    color: var(--text-light);
    gap: var(--s2);
}

.ai-state i {
    font-size: 2rem;
    color: var(--ink-line-strong);
}

.ai-error i {
    color: var(--accent-color);
}

.ai-loading-bar {
    width: 60%;
    height: 3px;
    background: var(--bg-light);
    overflow: hidden;
    position: relative;
}

.ai-loading-bar span {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 40%;
    background: var(--accent-color);
    animation: ai-indeterminate 1.1s ease-in-out infinite;
}

@keyframes ai-indeterminate {
    0% {
        left: -40%;
    }

    100% {
        left: 100%;
    }
}

/* --- Result --- */
.ai-score-row {
    display: flex;
    align-items: flex-end;
    gap: var(--s3);
    margin-bottom: var(--s3);
}

.ai-score-fig {
    font-family: var(--font-mono);
    font-size: var(--fs-anchor);
    font-weight: 700;
    line-height: 0.9;
    color: var(--accent-color);
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.ai-score-unit {
    font-size: 0.4em;
    margin-left: 0.1em;
}

.ai-score-caption {
    font-size: var(--fs-fine);
    color: var(--text-light);
    margin-bottom: var(--s1);
}

.ai-verdict {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
    font-weight: 700;
    letter-spacing: 0.1em;
    padding: 0.25rem 0.6rem;
    border-radius: 0;
    color: #fff;
}

.ai-verdict.v-human {
    background: var(--primary-color);
}

.ai-verdict.v-mixed {
    background: #8792a2;
}

.ai-verdict.v-ai {
    background: var(--accent-color);
}

/* meter */
.ai-meter {
    height: 8px;
    background: var(--bg-light);
    border: 1px solid var(--ink-line);
    margin-bottom: var(--s4);
    overflow: hidden;
}

.ai-meter-fill {
    height: 100%;
    width: 0;
    background: var(--accent-color);
    transition: width 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* metrics */
.ai-metrics {
    display: flex;
    gap: var(--s4);
    padding: var(--s2) 0 var(--s3);
    border-top: 1px solid var(--ink-line);
    margin-bottom: var(--s3);
    flex-wrap: wrap;
}

.ai-metric {
    display: flex;
    flex-direction: column;
}

.ai-metric-val {
    font-family: var(--font-mono);
    font-size: var(--fs-sub);
    font-weight: 700;
    color: var(--text-dark);
    font-variant-numeric: tabular-nums;
}

.ai-metric-label {
    font-size: var(--fs-meta);
    color: var(--text-light);
    letter-spacing: 0.04em;
}

/* sentence breakdown */
.ai-sentences {
    line-height: 2;
    font-size: var(--fs-body);
    color: var(--text-dark);
    max-height: 260px;
    overflow-y: auto;
    padding: var(--s2) 0;
}

.ai-sent {
    padding: 1px 3px;
    border-bottom: 2px solid transparent;
}

.ai-sent.s-human {
    background: rgba(30, 144, 255, 0.10);
    border-bottom-color: rgba(30, 144, 255, 0.5);
}

.ai-sent.s-mixed {
    background: rgba(135, 146, 162, 0.14);
    border-bottom-color: rgba(135, 146, 162, 0.6);
}

.ai-sent.s-ai {
    background: rgba(255, 107, 53, 0.16);
    border-bottom-color: rgba(255, 107, 53, 0.6);
}

.ai-legend {
    display: flex;
    gap: var(--s3);
    margin-top: var(--s2);
    font-size: var(--fs-meta);
    color: var(--text-light);
    flex-wrap: wrap;
}

.ai-legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.ai-swatch {
    width: 12px;
    height: 12px;
    display: inline-block;
}

.swatch-human {
    background: rgba(30, 144, 255, 0.5);
}

.swatch-mixed {
    background: rgba(135, 146, 162, 0.6);
}

.swatch-ai {
    background: rgba(255, 107, 53, 0.6);
}

/* humanize stub */
.ai-humanize-row {
    display: flex;
    align-items: center;
    gap: var(--s2);
    margin-top: var(--s4);
    padding-top: var(--s3);
    border-top: 1px solid var(--ink-line);
}

.ai-soon {
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
    letter-spacing: 0.14em;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 2px 6px;
}

/* --- Follow-up chat --- */
.ai-chat-block {
    margin-top: var(--s5);
    border: 1px solid var(--ink-line-strong);
    padding: var(--s4);
}

.ai-chat-messages {
    display: flex;
    flex-direction: column;
    gap: var(--s2);
    max-height: 340px;
    overflow-y: auto;
    padding: var(--s2) 0 var(--s3);
}

.ai-msg {
    max-width: 78%;
    padding: 0.7rem 0.9rem;
    font-size: var(--fs-fine);
    line-height: 1.6;
    border-radius: 0;
}

.ai-msg.user {
    align-self: flex-end;
    background: var(--secondary-color);
    color: #fff;
}

.ai-msg.bot {
    align-self: flex-start;
    background: var(--bg-light);
    color: var(--text-dark);
    border: 1px solid var(--ink-line);
}

.ai-msg.typing {
    color: var(--text-light);
    font-style: italic;
}

/* Rendered markdown inside bot chat bubbles */
.ai-msg p {
    margin: 0 0 0.5em;
}

.ai-msg p:last-child {
    margin-bottom: 0;
}

.ai-msg p.ai-md-h {
    font-weight: 700;
}

.ai-msg ul,
.ai-msg ol {
    margin: 0.25em 0 0.55em;
    padding-left: 1.3em;
}

.ai-msg li {
    margin: 0.15em 0;
}

.ai-msg strong {
    font-weight: 700;
}

.ai-msg em {
    font-style: italic;
}

.ai-msg code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    background: rgba(44, 62, 80, 0.08);
    padding: 0.05em 0.32em;
}

.ai-msg a {
    color: var(--primary-color);
    text-decoration: underline;
}

.ai-msg blockquote {
    margin: 0.3em 0 0.55em;
    padding-left: 0.7em;
    border-left: 3px solid var(--ink-line-strong);
    color: var(--text-light);
}

/* --- Humanized output block --- */
.ai-humanize-block {
    margin-top: var(--s5);
    border: 1px solid var(--ink-line-strong);
    padding: var(--s4);
}

.ai-humanize-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s2);
    margin-bottom: var(--s3);
    flex-wrap: wrap;
}

.ai-humanize-actions {
    display: flex;
    gap: var(--s2);
}

.ai-humanized-text {
    white-space: pre-wrap;
    line-height: 1.85;
    font-size: var(--fs-body);
    color: var(--text-dark);
    background: var(--bg-light);
    border: 1px solid var(--ink-line);
    padding: var(--s3);
    max-height: 440px;
    overflow-y: auto;
}

.ai-recheck-result {
    display: flex;
    align-items: baseline;
    gap: var(--s2);
    margin-bottom: var(--s3);
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

.ai-recheck-label {
    font-size: var(--fs-meta);
    letter-spacing: 0.14em;
    color: var(--text-light);
    margin-right: var(--s1);
    align-self: center;
}

.ai-recheck-before {
    font-size: var(--fs-sub);
    color: var(--text-light);
    text-decoration: line-through;
}

.ai-recheck-arrow {
    color: var(--text-light);
}

.ai-recheck-after {
    font-size: var(--fs-h2);
    font-weight: 700;
    line-height: 1;
}

.ai-recheck-after.v-human {
    color: var(--primary-color);
}

.ai-recheck-after.v-mixed {
    color: #8792a2;
}

.ai-recheck-after.v-ai {
    color: var(--accent-color);
}

/* =====================================================================
   Accounts, credits & recharge
   ===================================================================== */

/* --- Header account widget --- */
.ai-account {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
}

.ai-acct-btn {
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.55);
    border-radius: 0;
    padding: 0.3rem 0.7rem;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.ai-acct-btn:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: #fff;
}

.ai-acct-ghost {
    border-color: rgba(255, 255, 255, 0.3);
}

.ai-acct-balance {
    color: #fff;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: baseline;
    gap: 4px;
    white-space: nowrap;
}

.ai-acct-balance b {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--accent-color, #ff6b35);
}

.ai-acct-bal-label {
    opacity: 0.85;
}

/* --- Per-action cost labels --- */
.ai-cost {
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
    color: var(--text-light);
    letter-spacing: 0.04em;
    align-self: center;
    white-space: nowrap;
}

/* --- Modals (auth + recharge) --- */
.ai-modal {
    position: fixed;
    inset: 0;
    z-index: 100000;
    background: rgba(20, 30, 42, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--s3);
}

.ai-modal-panel {
    position: relative;
    background: var(--bg-white);
    border: 1px solid var(--ink-line-strong);
    width: 100%;
    max-width: 420px;
    padding: var(--s5) var(--s4) var(--s4);
}

.ai-modal-close {
    position: absolute;
    top: 6px;
    right: 10px;
    background: none;
    border: none;
    font-size: 1.7rem;
    line-height: 1;
    color: var(--text-light);
    cursor: pointer;
}

.ai-modal-tabs {
    display: flex;
    margin-bottom: var(--s4);
    border-bottom: 1px solid var(--ink-line);
}

.ai-tab {
    flex: 1;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.6rem 0;
    font-size: var(--fs-body);
    font-weight: 700;
    color: var(--text-light);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.ai-tab.is-active {
    color: var(--text-dark);
    border-bottom-color: var(--accent-color);
}

.ai-tab.is-disabled,
.ai-tab:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.ai-register-notice {
    padding: var(--s4) var(--s2);
    text-align: center;
    font-size: var(--fs-body);
    color: var(--text-dark);
    line-height: 1.7;
}

.ai-auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--s2);
}

.ai-modal-input {
    border: 1px solid var(--ink-line);
    border-radius: 0;
    padding: 0.7rem 0.8rem;
    font-size: var(--fs-body);
    font-family: inherit;
    color: var(--text-dark);
    background: var(--bg-light);
    outline: none;
    transition: border-color 0.2s ease;
}

.ai-modal-input:focus {
    border-color: var(--primary-color);
    background: var(--bg-white);
}

.ai-modal-submit {
    margin-top: var(--s2);
}

.ai-auth-error {
    color: var(--accent-hover, #ff4d00);
    font-size: var(--fs-fine);
    min-height: 1.1em;
}

.ai-modal-hint {
    font-size: var(--fs-meta);
    color: var(--text-light);
    margin: var(--s3) 0 0;
    line-height: 1.6;
}

.ai-modal-back {
    display: inline-block;
    margin-top: var(--s2);
    font-size: var(--fs-meta);
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.15s ease;
}

.ai-modal-back:hover {
    color: var(--accent-color);
}

/* --- Recharge packages --- */
.ai-packages {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s2);
    margin-top: var(--s3);
}

.ai-pkg {
    border: 1px solid var(--ink-line);
    padding: var(--s3) var(--s2);
    text-align: center;
}

.ai-pkg-credits {
    font-size: var(--fs-fine);
    color: var(--text-dark);
}

.ai-pkg-credits b {
    font-family: var(--font-mono);
    font-size: var(--fs-sub);
    color: var(--accent-color);
}

.ai-pkg-label {
    font-size: var(--fs-meta);
    color: var(--text-light);
    margin: 4px 0;
}

.ai-pkg-price {
    font-family: var(--font-mono);
    font-size: var(--fs-body);
    color: var(--text-dark);
    margin-bottom: var(--s2);
}

.ai-pkg-buy {
    width: 100%;
    padding: 0.5rem;
    font-size: var(--fs-fine);
}

.ai-pkg-loading {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-light);
    padding: var(--s4);
}

@media (max-width: 520px) {
    .ai-packages {
        grid-template-columns: 1fr;
    }
}

.ai-chat-input-row {
    display: flex;
    gap: var(--s2);
}

.ai-chat-input {
    flex: 1;
    min-width: 0;
    border: 1px solid var(--ink-line);
    border-radius: 0;
    padding: 0.7rem 0.9rem;
    font-family: inherit;
    font-size: var(--fs-body);
    color: var(--text-dark);
    background: var(--bg-light);
    outline: none;
    transition: border-color 0.2s ease;
}

.ai-chat-input:focus {
    border-color: var(--primary-color);
    background: var(--bg-white);
}

.ai-chat-hint {
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
    color: var(--text-light);
    margin: var(--s2) 0 0;
    letter-spacing: 0.02em;
}

/* --- Footer trim on this page --- */
.ai-footer .footer-container {
    grid-template-columns: 1.4fr 1fr;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .ai-grid {
        grid-template-columns: 1fr;
    }

    .ai-input-panel {
        border-right: none;
        border-bottom: 1px solid var(--ink-line-strong);
    }
}

@media (max-width: 768px) {
    .ai-wrap {
        padding: 0 var(--s3) 0 var(--spine);
    }

    .ai-page {
        padding: var(--s5) 0 var(--s6);
    }

    .ai-intro {
        margin-bottom: var(--s5);
    }
}