/* ============================================
   گفتارساز — Modern Minimal RTL Design
   Mobile-first, lightweight
   ============================================ */

:root {
    --color-primary: #0f766e;
    --color-primary-light: #14b8a6;
    --color-primary-dark: #0d5c56;
    --color-accent: #7c3aed;
    --color-bg: #f8fafb;
    --color-bg-alt: #f1f5f9;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 20px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);
    --font: 'Vazirmatn', system-ui, -apple-system, sans-serif;
    --transition: 0.2s ease;
    --header-h: 64px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover { color: var(--color-primary-dark); }

.container {
    width: 100%;
    max-width: 1120px;
    margin-inline: auto;
    padding-inline: 1.25rem;
}

.container-narrow { max-width: 720px; }

.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;
}

[hidden] {
    display: none !important;
}

.skip-link {
    position: absolute;
    top: -100%;
    right: 1rem;
    z-index: 9999;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* ---- Header ---- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.125rem;
}
.logo:hover { color: var(--color-primary); }
.logo-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    object-fit: contain;
}

.header-nav {
    display: none;
    gap: 1.5rem;
}
.header-nav a {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}
.header-nav a:hover { color: var(--color-primary); }

.header-auth {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-inline-start: auto;
}

.header-user-mobile {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    direction: ltr;
    unicode-bidi: plaintext;
}

.btn-header-auth {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0.4rem 0.85rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-header-auth:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-header-auth-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-color: transparent;
    color: #fff;
}

.btn-header-auth-primary:hover {
    color: #fff;
    box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
}

/* ---- Auth modal ---- */
body.auth-modal-open { overflow: hidden; }

.auth-modal[hidden] { display: none; }

.auth-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.auth-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
}

.auth-modal-panel {
    position: relative;
    width: 100%;
    max-width: 400px;
    padding: 1.75rem 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.25s ease;
}

.auth-modal-close {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: var(--color-bg);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.auth-modal-close:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.auth-modal-header {
    margin-bottom: 1.25rem;
    padding-inline-end: 2rem;
}

.auth-modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.auth-modal-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.auth-form { margin-top: 0.5rem; }

.auth-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.auth-input {
    width: 100%;
    padding: 0.85rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 1rem;
    direction: ltr;
    text-align: left;
    transition: border-color var(--transition);
}

.auth-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.15);
}

.auth-input-code {
    letter-spacing: 0.35em;
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
}

.auth-sent-to {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.auth-sent-to strong {
    color: var(--color-text);
    direction: ltr;
    unicode-bidi: plaintext;
}

.auth-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.auth-actions .btn {
    width: 100%;
    margin-top: 0;
}

.auth-submit { margin-bottom: 0; }

.auth-back-btn {
    min-height: 42px;
    padding-block: 0.65rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.auth-modal .alert { margin-top: 0; margin-bottom: 1rem; }

/* ---- Hero ---- */
.hero {
    padding: 2rem 0 3rem;
    background:
        radial-gradient(ellipse 80% 60% at 50% -10%, rgba(20, 184, 166, 0.12), transparent),
        var(--color-bg);
}

.hero-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
}

.hero-top {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    width: 100%;
}

.hero-content {
    width: 100%;
}

.hero-visual {
    margin: 0;
    width: 100%;
    max-width: 420px;
    margin-inline: auto;
    line-height: 0;
}

.hero-visual img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-xl);
  
}

.hero-badge {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    background: rgba(15, 118, 110, 0.1);
    color: var(--color-primary);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.hero-content h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-lead {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
    max-width: 520px;
}

.hero-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.hero-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}
.hero-features svg { color: var(--color-primary); flex-shrink: 0; }

/* ---- TTS Card ---- */
.tts-card {
    width: 100%;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.section-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.75rem;
    display: block;
}

.voice-fieldset {
    border: none;
    margin-bottom: 1.5rem;
}

.voice-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.65rem;
}

.voice-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
    position: relative;
    background: var(--color-surface);
}
.voice-card:hover {
    border-color: var(--voice-color, var(--color-primary));
    background: color-mix(in srgb, var(--voice-color, var(--color-primary)) 4%, white);
}
.voice-card.is-selected {
    border-color: var(--voice-color, var(--color-primary));
    background: color-mix(in srgb, var(--voice-color, var(--color-primary)) 8%, white);
}
.voice-card:focus-within:not(.is-selected) {
    outline: 2px solid var(--voice-color, var(--color-primary));
    outline-offset: 2px;
}

.voice-avatar {
    --avatar-size: 72px;
    width: var(--avatar-size);
    height: var(--avatar-size);
    border-radius: 50%;
    flex-shrink: 0;
    border: 2px solid var(--voice-color, var(--color-primary));
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.14);
    object-fit: cover;
    object-position: center 15%;
    background-color: #1e293b;
}

.voice-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 0;
}
.voice-name {
    font-weight: 600;
    font-size: 0.95rem;
}
.voice-desc {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.voice-sample-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    padding: 0.4rem 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-muted);
    font-family: var(--font);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}
.voice-sample-btn:not(:disabled):hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(15, 118, 110, 0.06);
}
.voice-sample-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.voice-sample-btn .icon-pause { display: none; }
.voice-sample-btn.is-playing .icon-play { display: none; }
.voice-sample-btn.is-playing .icon-pause { display: block; }
.voice-sample-btn.is-playing {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(15, 118, 110, 0.08);
}

.voice-check {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--voice-color, var(--color-primary));
    color: #fff;
    display: none;
    align-items: center;
    justify-content: center;
}
.voice-card.is-selected .voice-check { display: flex; }

/* ---- Text Input ---- */
.text-field { margin-bottom: 1.25rem; }

.text-field-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.char-counter {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
}
.char-counter.is-warning { color: #d97706; }
.char-counter.is-limit { color: var(--color-error); font-weight: 600; }

#tts-text {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    resize: vertical;
    min-height: 140px;
    transition: border-color var(--transition), box-shadow var(--transition);
}
#tts-text::placeholder { color: #94a3b8; }
#tts-text:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
    background: var(--color-surface);
}

.field-hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.4rem;
}

.char-limit-hint,
.quota-hint {
    color: var(--color-error);
    font-weight: 500;
}
.char-limit-hint a,
.quota-hint a {
    color: inherit;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.usage-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0.65rem 0.85rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
}
.usage-summary-label {
    color: var(--color-text-muted);
    font-weight: 500;
}
.usage-summary-value {
    font-weight: 600;
    color: var(--color-text);
    direction: ltr;
    unicode-bidi: plaintext;
}

/* ---- Buttons ---- */
.tts-actions { margin-bottom: 0.5rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    width: 100%;
    min-height: 48px;
    -webkit-tap-highlight-color: transparent;
}
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff;
    box-shadow: 0 4px 14px rgba(15, 118, 110, 0.3);
}
.btn-primary:not(:disabled):hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(15, 118, 110, 0.35);
}
.btn-primary:not(:disabled):active { transform: translateY(0); }

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    width: auto;
    margin-top: 0.75rem;
}
.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    box-shadow: none;
    width: auto;
    margin-top: 0;
}
.btn-ghost:hover {
    background: var(--color-bg);
    color: var(--color-primary);
    border-color: transparent;
    transform: none;
    box-shadow: none;
}

.btn.is-loading .btn-text { opacity: 0; }
.btn.is-loading .btn-loader { display: block; }

.btn-loader {
    display: none;
    position: absolute;
    width: 22px;
    height: 22px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
.btn { position: relative; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Result ---- */
.tts-result {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--color-border);
    animation: fadeIn 0.3s ease;
}
.result-label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}
.audio-player-wrap audio {
    width: 100%;
    height: 44px;
    border-radius: var(--radius-sm);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---- Alert ---- */
.alert {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    margin-top: 1rem;
}
.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid #fecaca;
    word-break: break-word;
    line-height: 1.6;
}
.alert-error a {
    color: inherit;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ---- Conversion history ---- */
.history-header {
    margin-bottom: 1.5rem;
}
.history-header .section-title {
    margin-bottom: 0.35rem;
}
.history-plan {
    margin-bottom: 0;
    text-align: center;
}
.history-list {
    display: grid;
    gap: 0.75rem;
    max-width: 720px;
    margin: 0 auto;
}
.history-item {
    padding: 1rem 1.15rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.history-item-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.82rem;
    color: var(--color-text-muted);
}
.history-voice {
    font-weight: 600;
    color: var(--color-primary);
}
.history-meta-end {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-inline-start: auto;
    flex-shrink: 0;
}
.history-chars {
    white-space: nowrap;
}
.history-text {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text);
}
.history-actions {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    flex-shrink: 0;
}
.btn-history-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.85rem;
    height: 1.85rem;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
    text-decoration: none;
    flex-shrink: 0;
}
.btn-history-icon:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(15, 118, 110, 0.06);
}
.btn-history-icon svg {
    display: block;
}
.btn-history-play .icon-pause { display: none; }
.btn-history-play.is-playing .icon-play { display: none; }
.btn-history-play.is-playing .icon-pause { display: block; }
.btn-history-play.is-playing {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(15, 118, 110, 0.08);
}
.history-empty {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 28rem;
    margin: 0 auto;
    line-height: 1.7;
}

/* ---- Upgrade / pricing page ---- */
.upgrade-section {
    padding-top: 2.5rem;
    padding-bottom: 4rem;
}
.upgrade-intro {
    margin-bottom: 2.5rem;
}
.upgrade-lead-center {
    max-width: 36rem;
    margin-inline: auto;
}
.upgrade-lead-center strong {
    color: var(--color-primary);
}
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}
.pricing-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 1.75rem 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}
.pricing-card.is-popular {
    border-color: var(--color-primary);
    box-shadow: 0 8px 30px rgba(15, 118, 110, 0.15);
}
.pricing-badge {
    position: absolute;
    top: -0.65rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    background: var(--color-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
}
.pricing-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}
.pricing-price {
    text-align: center;
    margin-bottom: 0.25rem;
}
.pricing-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
}
.pricing-period {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}
.pricing-chars {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1.25rem;
}
.pricing-features {
    list-style: none;
    display: grid;
    gap: 0.55rem;
    margin-bottom: 1.5rem;
    flex: 1;
}
.pricing-features li {
    font-size: 0.9rem;
    padding-inline-start: 1.25rem;
    position: relative;
    line-height: 1.6;
}
.pricing-features li::before {
    content: '✓';
    position: absolute;
    inset-inline-start: 0;
    color: var(--color-primary);
    font-weight: 700;
}
.pricing-pay-form {
    width: 100%;
    margin-top: auto;
    padding-top: 0.5rem;
}
.upgrade-section .pricing-btn {
    width: 100%;
    min-width: 0;
    margin-top: 0;
    padding: 0.6rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    min-height: 40px;
    border-radius: var(--radius-sm);
}
.upgrade-section .pricing-btn.btn-secondary {
    width: 100%;
    margin-top: 0;
    background: transparent;
    border: 1.5px solid var(--color-border);
    box-shadow: none;
}
.upgrade-section .pricing-btn.btn-secondary:hover {
    background: var(--color-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: none;
}
.upgrade-section .pricing-btn.btn-primary {
    box-shadow: 0 2px 10px rgba(15, 118, 110, 0.22);
}
.upgrade-section .pricing-btn.btn-primary:not(:disabled):hover {
    box-shadow: 0 4px 14px rgba(15, 118, 110, 0.28);
}
.upgrade-footnote {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}
.upgrade-footnote .btn {
    width: auto;
    min-width: 0;
    padding: 0.5rem 1.1rem;
    font-size: 0.85rem;
    font-weight: 500;
    min-height: 36px;
    margin-top: 0;
}

/* Payment callback */
.payment-result-actions {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}
.upgrade-section .payment-result-btn {
    width: 100%;
    min-width: 0;
    margin-top: 0;
    padding: 0.6rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    min-height: 40px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    text-align: center;
}
.upgrade-section .payment-result-btn.btn-secondary {
    width: 100%;
    margin-top: 0;
    background: transparent;
    border: 1.5px solid var(--color-border);
    box-shadow: none;
}
.upgrade-section .payment-result-btn.btn-secondary:hover {
    background: var(--color-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: none;
}
.upgrade-section .payment-result-btn.btn-primary {
    box-shadow: 0 2px 10px rgba(15, 118, 110, 0.22);
}
.upgrade-section .payment-result-btn.btn-primary:hover {
    box-shadow: 0 4px 14px rgba(15, 118, 110, 0.28);
}
@media (min-width: 480px) {
    .payment-result-actions {
        flex-direction: row;
    }
    .upgrade-section .payment-result-btn {
        flex: 1;
    }
}
.upgrade-footnote p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    max-width: 32rem;
    line-height: 1.7;
}

/* ---- Sections ---- */
.section {
    padding: 3.5rem 0;
}
.section-alt {
    background: var(--color-bg-alt);
}
.section-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}
.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
    font-size: 1rem;
}

/* Steps */
.steps-grid {
    list-style: none;
    display: grid;
    gap: 1.25rem;
}
.step-card {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    text-align: center;
}
.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(15, 118, 110, 0.1);
    color: var(--color-primary);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}
.step-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}
.step-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Uses */
.uses-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.use-card {
    background: var(--color-surface);
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}
.use-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}
.use-card h3 {
    font-size: 0.95rem;
    margin-bottom: 0.35rem;
}
.use-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}
.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.faq-item summary {
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    -webkit-tap-highlight-color: transparent;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    font-size: 1.25rem;
    color: var(--color-text-muted);
    transition: transform var(--transition);
    flex-shrink: 0;
    margin-right: 0.5rem;
}
.faq-item[open] summary::after {
    content: '−';
    color: var(--color-primary);
}
.faq-item p {
    padding: 0 1.25rem 1rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-text);
    color: #94a3b8;
    padding: 2.5rem 0 calc(2rem + var(--safe-bottom));
    margin-top: 1rem;
}
.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
}
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
}
.footer-logo:hover { color: #fff; }
.footer-logo img {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}
.footer-brand .logo-text {
    color: inherit;
    font-weight: 700;
    font-size: 1.1rem;
}
.footer-brand p {
    font-size: 0.85rem;
    margin-top: 0.35rem;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.footer-links a {
    color: #94a3b8;
    font-size: 0.85rem;
}
.footer-links a:hover { color: #fff; }
.footer-copy {
    font-size: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* ============================================
   Responsive — Tablet & Desktop
   ============================================ */

@media (min-width: 640px) {
    .voice-grid {
        grid-template-columns: 1fr 1fr;
    }

    .hero-features {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .uses-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .btn { width: auto; min-width: 200px; }
    .tts-actions { display: flex; }
}

@media (min-width: 768px) {
    .header-inner {
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        align-items: center;
    }

    .logo { justify-self: start; }

    .header-nav {
        display: flex;
        justify-self: center;
    }

    .header-auth {
        margin-inline-start: 0;
        justify-self: end;
    }

    .hero {
        padding: 3.5rem 0 4rem;
    }

    .hero-top {
        flex-direction: row;
        align-items: center;
        gap: 2.5rem;
    }

    .hero-content {
        flex: 1;
        min-width: 0;
    }

    .hero-visual {
        flex: 0 0 42%;
        max-width: 480px;
        margin-inline: 0;
    }

    .tts-card {
        padding: 2rem;
    }

    .footer-inner {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
        text-align: right;
    }
    .footer-copy {
        width: 100%;
        text-align: center;
    }
}

@media (min-width: 1024px) {
    .container { padding-inline: 2rem; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}