/* Pro File Converter — BGrade Design System — Mobile-First Responsive */

:root {
    --bg: #f8fafc;
    --surface: rgba(255, 255, 255, 0.8);
    --surface-s: #ffffff;
    --muted-bg: #f1f5f9;
    --text: #0f172a;
    --muted: #64748b;
    --border: rgba(99, 102, 241, 0.15);
    --primary: #6366f1;
    --pri-hov: #4f46e5;
    --pri-lit: rgba(99, 102, 241, 0.1);
    --success: #10b981;
    --danger: #ef4444;
    --r-sm: 8px;
    --r-md: 14px;
    --r-lg: 20px;
    --r-xl: 28px;
    --shadow: 0 8px 32px rgba(99, 102, 241, 0.08);
    --blur: blur(16px);
    --ease: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg: #0f172a;
    --surface: rgba(30, 41, 59, 0.85);
    --surface-s: #1e293b;
    --muted-bg: #1a2744;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --border: rgba(129, 140, 248, 0.2);
    --primary: #818cf8;
    --pri-hov: #a5b4fc;
    --pri-lit: rgba(129, 140, 248, 0.12);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

h1,
h2,
h3,
h4 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

.grad {
    background: linear-gradient(135deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Blobs */
.bg-blob {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    z-index: -1;
    pointer-events: none;
    filter: blur(90px);
    animation: blob 20s infinite alternate;
}

.blob-1 {
    background: radial-gradient(circle, rgba(99, 102, 241, 0.2), transparent 70%);
    top: -150px;
    right: -150px;
}

.blob-2 {
    background: radial-gradient(circle, rgba(168, 85, 247, 0.15), transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: -10s;
}

@keyframes blob {
    to {
        transform: translate(80px, 120px) scale(1.15);
    }
}

/* Utilities */
.hidden {
    display: none !important;
}

.w-full {
    width: 100%;
}

.text-muted {
    color: var(--muted);
}

.text-sm {
    font-size: 0.875rem;
}

/* Glass */
.glass-panel {
    background: var(--surface);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    box-shadow: var(--shadow);
}

/* Toast */
.toast-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    padding: 0.85rem 1.25rem;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    animation: slideIn 0.3s ease;
    background: var(--surface-s);
    border: 1px solid var(--border);
    color: var(--text);
}

.toast.success {
    background: #ecfdf5;
    border-color: #10b981;
    color: #065f46;
}

.toast.error {
    background: #fef2f2;
    border-color: #ef4444;
    color: #991b1b;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%)
    }

    to {
        opacity: 1;
        transform: translateX(0)
    }
}

/* Page wrap — Mobile-first responsive */
.page-wrap {
    max-width: 1020px;
    margin: 0 auto;
    padding: clamp(70px, 8vw, 90px) 0.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Promo Banner */
.promo-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1rem;
    background: linear-gradient(135deg, var(--primary), #a855f7);
    border-radius: var(--r-lg);
    color: #fff;
    font-size: 0.85rem;
    flex-wrap: wrap;
}

.promo-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 200px;
}

.promo-badge {
    background: rgba(255, 255, 255, 0.25);
    padding: 0.2rem 0.7rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    white-space: nowrap;
}

.promo-btn {
    background: #fff;
    color: var(--primary);
    padding: 0.45rem 1rem;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.8rem;
    white-space: nowrap;
    transition: var(--ease);
}

.promo-btn:hover {
    opacity: 0.9;
    transform: scale(1.02);
}

/* Hero */
.hero-section {
    text-align: center;
    padding: 0.25rem 0;
}

.hero-title {
    font-size: clamp(1.2rem, 5vw, 2rem);
    margin-bottom: 0.2rem;
    word-break: break-word;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-sub {
    color: var(--muted);
    font-size: clamp(0.75rem, 2.5vw, 0.85rem);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.2;
}

/* Stepper — Fully responsive */
.stepper-wrap {
    max-width: 480px;
    margin: clamp(1rem, 3vw, 2.5rem) auto 1rem;
    width: 100%;
}

.stepper {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.25rem;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    flex: 1;
    min-width: 0;
}

.step-num {
    width: clamp(24px, 6vw, 28px);
    height: clamp(24px, 6vw, 28px);
    border-radius: 50%;
    background: var(--surface-s);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--muted);
    transition: var(--ease);
    flex-shrink: 0;
}

.step-label {
    font-size: clamp(0.6rem, 2vw, 0.7rem);
    font-weight: 700;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: center;
}

.step.active .step-num {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px var(--pri-lit);
}

.step.active .step-label {
    color: var(--primary);
}

.step-line {
    flex: 1;
    height: 2px;
    background: var(--border);
    margin-top: 12px;
    align-self: flex-start;
    min-width: 20px;
}

/* Upload — Mobile optimized */
.upload-drop-area {
    padding: clamp(1rem, 4vw, 2rem) 1rem;
    text-align: center;
    border: 2px dashed var(--border);
    border-radius: var(--r-xl);
    background: var(--surface);
    backdrop-filter: var(--blur);
    cursor: pointer;
    transition: var(--ease);
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.upload-drop-area:hover,
.upload-drop-area.dragover {
    border-color: var(--primary);
    background: var(--pri-lit);
    transform: scale(1.01);
}

.upload-icon-wrapper {
    font-size: clamp(2rem, 8vw, 3rem);
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.upload-drop-area h2 {
    font-size: clamp(1rem, 3vw, 1.2rem);
    margin-bottom: 0.2rem;
}

.supported-label {
    display: block;
    margin-top: 0.5rem;
    font-size: clamp(0.6rem, 2vw, 0.7rem);
    color: var(--muted);
}

/* Buttons — Touch-friendly (min 44px height) */
.btn {
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--ease);
    min-height: 36px;
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    padding: clamp(0.4rem, 1.5vw, 0.6rem) clamp(0.8rem, 2.5vw, 1.25rem);
}

.primary-btn {
    background: var(--primary);
    color: #fff;
    border-radius: var(--r-md);
}

.primary-btn:hover {
    background: var(--pri-hov);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--pri-lit);
}

.secondary-btn {
    background: var(--surface-s);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--r-md);
}

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

/* Settings grid — Stack on mobile */
.app-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    align-items: start;
}

@media (min-width:769px) {
    .app-grid {
        grid-template-columns: 1fr 1.2fr;
    }
}

/* Preview Panel */
.preview-panel {
    padding: 0.75rem;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: clamp(0.85rem, 3vw, 0.95rem);
    font-weight: 700;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.panel-header i {
    color: var(--primary);
    font-size: clamp(0.9rem, 3vw, 1.1rem);
}

.preview-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.preview-area {
    position: relative;
    border-radius: var(--r-md);
    overflow: hidden;
    background: var(--muted-bg);
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-area img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.file-type-badge {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    background: var(--primary);
    color: #fff;
    padding: 0.15rem 0.3rem;
    border-radius: 4px;
    font-size: clamp(0.55rem, 1.5vw, 0.6rem);
    font-weight: 800;
    letter-spacing: 0.05em;
}

.file-stats {
    display: flex;
    flex-direction: row;
    gap: clamp(0.25rem, 1vw, 0.4rem);
    flex: 1;
}

.stat {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: clamp(0.6rem, 2vw, 0.7rem);
    padding: clamp(0.2rem, 1vw, 0.4rem);
    background: var(--muted-bg);
    border-radius: 8px;
    text-align: center;
    min-width: 0;
}

.stat .label {
    color: var(--muted);
    font-weight: 500;
    font-size: clamp(0.55rem, 1.5vw, 0.65rem);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.1rem;
}

.stat .value {
    font-weight: 700;
    text-align: center;
    word-break: break-all;
    font-size: clamp(0.7rem, 2vw, 0.85rem);
}

.reset-btn {
    width: 100%;
    background: transparent;
    color: var(--danger);
    border: 1.5px solid var(--danger);
    padding: 0.75rem;
    border-radius: var(--r-md);
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--ease);
    font-family: inherit;
    min-height: 44px;
    font-size: 0.9rem;
}

.reset-btn:hover {
    background: var(--danger);
    color: #fff;
}

/* Settings Panel */
.settings-panel {
    padding: clamp(0.75rem, 2vw, 1rem);
}

.settings-content {
    display: flex;
    flex-direction: column;
    gap: clamp(0.75rem, 2vw, 1rem);
}

.setting-block {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.block-label {
    font-size: clamp(0.7rem, 2vw, 0.8rem);
    font-weight: 800;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* Format grid — Responsive */
.format-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(0.2rem, 1vw, 0.4rem);
}

.format-opt {
    background: var(--surface-s);
    border: 1.5px solid var(--border);
    padding: clamp(0.2rem, 1vw, 0.4rem) 0;
    border-radius: var(--r-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    cursor: pointer;
    transition: var(--ease);
    font-family: inherit;
    min-height: 36px;
    justify-content: center;
}

.format-opt i {
    font-size: clamp(1rem, 3vw, 1.3rem);
    color: var(--muted);
    transition: var(--ease);
}

.format-opt span {
    font-size: clamp(0.7rem, 2vw, 0.8rem);
    font-weight: 800;
    color: var(--muted);
    transition: var(--ease);
}

.format-opt:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px var(--pri-lit);
}

.format-opt.active {
    background: var(--pri-lit);
    border-color: var(--primary);
}

.format-opt.active i,
.format-opt.active span {
    color: var(--primary);
}

/* Optimization */
.opt-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

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

.field-wrap {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: clamp(0.5rem, 1.5vw, 0.75rem);
    background: var(--muted-bg);
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
}

.field-icon {
    font-size: clamp(1.1rem, 3vw, 1.3rem);
    color: var(--primary);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

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

.field-content label {
    display: block;
    font-size: clamp(0.65rem, 2vw, 0.72rem);
    font-weight: 700;
    color: var(--muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.field-content input[type="number"] {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--border);
    padding: 0.3rem 0;
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    font-weight: 700;
    color: var(--text);
    font-family: inherit;
    transition: var(--ease);
}

.field-content input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
}

.field-content input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
    margin-top: 0.25rem;
    cursor: pointer;
    height: 6px;
}

/* Dimensions */
.dim-grid {
    display: flex;
    align-items: center;
    gap: clamp(0.25rem, 1vw, 0.5rem);
    flex-wrap: wrap;
}

.dim-field {
    flex: 1;
    min-width: 80px;
    background: var(--muted-bg);
    border: 1px solid var(--border);
    padding: clamp(0.4rem, 1.5vw, 0.5rem) clamp(0.5rem, 1.5vw, 0.75rem);
    border-radius: var(--r-md);
}

.dim-label {
    display: block;
    font-size: clamp(0.65rem, 2vw, 0.68rem);
    font-weight: 800;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 0.3rem;
}

.dim-field input {
    width: 100%;
    background: transparent;
    border: none;
    font-size: clamp(0.9rem, 2vw, 1rem);
    font-weight: 700;
    color: var(--text);
    font-family: inherit;
}

.dim-field input:focus {
    outline: none;
}

.lock-toggle {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--surface-s);
    border: 1.5px solid var(--border);
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: var(--ease);
    font-size: clamp(0.9rem, 2vw, 1.1rem);
}

.lock-toggle.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.lock-toggle:hover {
    transform: scale(1.1);
}

.convert-btn {
    padding: clamp(0.8rem, 2vw, 1.1rem) 1.5rem;
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    font-weight: 700;
    border-radius: var(--r-md);
    box-shadow: 0 8px 24px var(--pri-lit);
    width: 100%;
    min-height: 48px;
    margin-top: 1rem;
}

@media (max-width: 768px) {
    .convert-btn {
        position: fixed;
        bottom: clamp(0.5rem, 2vw, 1rem);
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - clamp(1rem, 4vw, 2rem));
        z-index: 100;
        box-shadow: 0 -4px 25px rgba(0, 0, 0, 0.4);
        border-radius: var(--r-xl);
    }

    .settings-content {
        padding-bottom: 80px;
    }
}

/* Result */
.result-card {
    padding: clamp(1rem, 3vw, 1.5rem) clamp(0.75rem, 2vw, 1rem);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(0.5rem, 2vw, 0.75rem);
}

.result-icon-wrap {
    width: clamp(40px, 10vw, 50px);
    height: clamp(40px, 10vw, 50px);
    background: var(--success);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1rem, 4vw, 1.5rem);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.25);
}

.result-card h2 {
    font-size: clamp(1.4rem, 4vw, 1.75rem);
}

.result-preview-box {
    width: 100%;
    max-width: 420px;
    border-radius: var(--r-lg);
    overflow: hidden;
    background: var(--muted-bg);
    border: 1px solid var(--border);
}

.result-preview-box img {
    width: 100%;
    display: block;
    height: auto;
}

.pdf-icon-placeholder {
    padding: clamp(2rem, 5vw, 4rem) 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: var(--primary);
}

.pdf-icon-placeholder span {
    font-size: clamp(0.85rem, 2vw, 1rem);
    font-weight: 600;
    color: var(--muted);
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    max-width: 420px;
}

.result-actions .btn {
    flex: 1;
    padding: clamp(0.7rem, 2vw, 1rem);
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    min-height: 48px;
}

@media (min-width:500px) {
    .result-actions {
        flex-direction: row;
    }

    .result-actions .btn {
        flex: 1;
    }
}

/* Sections */
.content-section {
    padding: clamp(0.75rem, 2vw, 1.5rem) 0;
}

.section-title {
    text-align: center;
    font-size: clamp(1.2rem, 4vw, 1.6rem);
    margin-bottom: clamp(0.75rem, 2vw, 1.5rem);
}

.section-title span {
    background: linear-gradient(135deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(1rem, 3vw, 1.5rem);
}

@media (min-width:640px) {
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (min-width:1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    padding: clamp(1.25rem, 3vw, 2rem) clamp(1rem, 2vw, 1.5rem);
    text-align: center;
    border-radius: var(--r-xl);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: var(--ease);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.feature-icon {
    width: clamp(48px, 10vw, 56px);
    height: clamp(48px, 10vw, 56px);
    background: linear-gradient(135deg, var(--primary), #a855f7);
    color: #fff;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto clamp(0.75rem, 2vw, 1.25rem);
    font-size: clamp(1.2rem, 3vw, 1.5rem);
}

.feature-card h3 {
    font-size: clamp(0.95rem, 3vw, 1.1rem);
    margin-bottom: 0.6rem;
}

.feature-card p {
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    color: var(--muted);
    line-height: 1.6;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(1rem, 3vw, 1.5rem);
}

@media (min-width:640px) {
    .testimonials-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }
}

.testimonial-card {
    padding: clamp(1rem, 3vw, 1.75rem);
    border-radius: var(--r-xl);
    display: flex;
    flex-direction: column;
    gap: clamp(0.75rem, 2vw, 1.25rem);
}

.testimonial-quote {
    font-style: italic;
    line-height: 1.7;
    font-size: clamp(0.85rem, 2vw, 0.95rem);
}

.testimonial-user {
    display: flex;
    align-items: center;
    gap: clamp(0.75rem, 2vw, 1rem);
}

.user-avatar {
    width: clamp(36px, 8vw, 44px);
    height: clamp(36px, 8vw, 44px);
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-info h4 {
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    font-weight: 700;
}

.user-info p {
    font-size: clamp(0.7rem, 2vw, 0.78rem);
    color: var(--muted);
    margin-top: 0.1rem;
}

/* Feedback form */
.feedback-form-wrap {
    max-width: 580px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    padding: clamp(1.5rem, 3vw, 2.5rem);
    text-align: center;
    box-shadow: var(--shadow);
}

.feedback-form-wrap h3 {
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    margin-bottom: 0.5rem;
}

.feedback-form-wrap h3 span {
    background: linear-gradient(135deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feedback-form-wrap>p {
    color: var(--muted);
    margin-bottom: clamp(1rem, 2vw, 1.75rem);
    font-size: clamp(0.85rem, 2vw, 0.95rem);
}

.form-fields {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.form-fields input,
.form-fields textarea {
    width: 100%;
    padding: clamp(0.65rem, 2vw, 0.85rem) clamp(0.8rem, 2vw, 1.1rem);
    border-radius: var(--r-md);
    border: 1.5px solid var(--border);
    background: var(--surface-s);
    color: var(--text);
    font-family: inherit;
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    transition: var(--ease);
    resize: vertical;
    min-height: 44px;
}

.form-fields textarea {
    min-height: 100px;
}

.form-fields input:focus,
.form-fields textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.star-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.5rem, 2vw, 0.75rem);
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    font-weight: 600;
    color: var(--muted);
    flex-wrap: wrap;
}

.stars {
    display: flex;
    gap: 4px;
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    color: #fbbf24;
    cursor: pointer;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    max-width: 720px;
    margin: 0 auto;
}

.faq-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    overflow: hidden;
    transition: var(--ease);
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    padding: clamp(0.85rem, 2vw, 1.1rem) clamp(1rem, 2vw, 1.4rem);
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: var(--ease);
    font-size: clamp(0.9rem, 2vw, 1rem);
    min-height: 44px;
}

.faq-question i {
    transition: var(--ease);
    color: var(--muted);
    flex-shrink: 0;
}

.faq-item.active .faq-question {
    color: var(--primary);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-answer {
    padding: 0 clamp(1rem, 2vw, 1.4rem) clamp(0.8rem, 2vw, 1.1rem);
    color: var(--muted);
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    line-height: 1.7;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* Footer */
.footer {
    text-align: center;
    padding-top: clamp(1.5rem, 3vw, 3rem);
    border-top: 1px solid var(--border);
    margin-top: clamp(1rem, 2vw, 1rem);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: clamp(1rem, 3vw, 2rem);
    margin-bottom: clamp(0.75rem, 2vw, 1.25rem);
    flex-wrap: wrap;
}

.footer-links a {
    text-decoration: none;
    color: var(--muted);
    font-size: clamp(0.75rem, 2vw, 0.85rem);
    font-weight: 600;
    transition: var(--ease);
}

.footer-links a:hover {
    color: var(--primary);
}

.copyright {
    font-size: clamp(0.7rem, 1.5vw, 0.78rem);
    color: var(--muted);
    opacity: 0.6;
}

/* Loader */
.ai-loader {
    width: 36px;
    height: 36px;
    border: 3px solid var(--pri-lit);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 2rem auto;
}

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

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(18px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.animate-fade-in {
    animation: fadeUp 0.55s ease forwards;
}

/* ╔════════════════════════════════════════════════════════════════╗
   ║     MOBILE-FIRST OPTIMIZATIONS (Extra Small to Medium)       ║
   ╚════════════════════════════════════════════════════════════════╝ */

/* Ultra-small screens (320px+) */
@media (max-width:380px) {
    .page-wrap {
        padding: 0.75rem 0.75rem 3rem;
        gap: 1rem;
    }

    .hero-title {
        font-size: 1.3rem;
    }

    .hero-sub {
        font-size: 0.75rem;
    }

    /* Stepper takes more width on tiny screens */
    .step {
        width: auto;
    }

    .step-label {
        font-size: 0.55rem;
    }

    .step-line {
        min-width: 12px;
    }

    /* Buttons more generous touch targets */
    .btn {
        padding: 0.7rem 1rem;
        min-height: 48px;
        font-size: 0.85rem;
    }

    /* Format grid - 2 columns only on tiny screens */
    .format-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Stack dimension controls vertically */
    .dim-grid {
        flex-direction: column;
    }

    .lock-toggle {
        width: 100%;
    }
}

/* Small screens (380px - 640px) */
@media (max-width:640px) {

    /* Toast positioned better for mobile */
    .toast-container {
        top: auto;
        bottom: 1rem;
        right: auto;
        left: 1rem;
        max-width: calc(100% - 2rem);
    }

    /* Settings stacking */
    .settings-content {
        gap: 1rem;
    }

    /* Better spacing for mobile forms */
    .opt-row {
        gap: 0.75rem;
    }

    /* Result actions stack on smaller screens */
    .result-actions {
        flex-direction: column;
    }

    /* Preview panel takes full width */
    .preview-panel,
    .settings-panel {
        padding: 1rem;
    }

    /* Feedback form mobile-friendly */
    .feedback-form-wrap {
        padding: 1.25rem;
        margin: 0 -1rem;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
}

/* Medium screens (641px - 768px) */
@media (min-width:641px) and (max-width:768px) {
    .app-grid {
        grid-template-columns: 1fr;
    }

    .opt-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large screens (769px+) */
@media (min-width:769px) {
    .page-wrap {
        padding: 1rem 1.5rem 4rem;
        gap: 2rem;
    }

    .app-grid {
        grid-template-columns: 1fr 1.2fr;
    }
}

/* Extra large screens (1200px+) */
@media (min-width:1200px) {
    .page-wrap {
        padding: 1.5rem 2rem 5rem;
    }

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

/* Touch device optimizations */
@media (hover:none) and (pointer:coarse) {

    /* Larger touch targets */
    .btn {
        min-height: 50px;
        min-width: 50px;
    }

    /* Remove hover effects on touch */
    .btn:hover {
        transform: none;
    }

    /* Better touch spacing */
    .format-opt {
        padding: clamp(0.8rem, 3vw, 1.2rem);
        min-height: 52px;
    }

    .faq-question {
        min-height: 52px;
        padding: clamp(0.8rem, 2vw, 1.2rem);
    }

    /* Larger inputs for touch */
    .form-fields input,
    .form-fields textarea {
        min-height: 48px;
        font-size: 16px;
    }

    /* Prevent zoom on input focus (iOS) */
    input,
    textarea,
    select {
        font-size: 16px !important;
    }
}

/* Landscape orientation optimizations */
@media (orientation:landscape) and (max-height:600px) {
    .page-wrap {
        padding: 0.5rem 1rem 2rem;
        gap: 1rem;
    }

    .hero-section {
        display: none;
    }

    .stepper-wrap {
        margin: 0 auto 0.75rem;
    }

    .upload-drop-area {
        padding: 2rem 1.5rem;
        min-height: auto;
    }

    .promo-banner {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }
}

/* High DPI / Retina screens */
@media (min-device-pixel-ratio:2) {

    .btn,
    .format-opt,
    .faq-question {
        border-width: 1px;
    }
}

/* Accessibility: Reduced motion */
@media (prefers-reduced-motion:reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto !important;
    }
}

/* Accessibility: High contrast mode */
@media (prefers-contrast:more) {
    --border:rgba(99, 102, 241, 0.3);
    --shadow:0 4px 16px rgba(0, 0, 0, 0.15);
}

/* Accessibility: Dark mode preference */
@media (prefers-color-scheme:dark) {
    [data-theme="light"] {
        --bg: #f8fafc;
        --text: #0f172a;
    }
}