/* ======================================================
   Compress — Warm Tactile Design
   Light, physical, not-a-template aesthetic
   ====================================================== */

:root {
    --bg: #FAF8F5;
    --surface: #FFFFFF;
    --surface-dim: #F0EDE8;
    --border: rgba(0, 0, 0, 0.06);
    --border-strong: rgba(0, 0, 0, 0.1);
    --text: #1A1A1A;
    --text-2: #6B6B6B;
    --text-3: #A0A0A0;
    --accent: #F97316;
    --accent-hover: #EA580C;
    --accent-soft: rgba(249, 115, 22, 0.08);
    --accent-glow: rgba(249, 115, 22, 0.15);
    --success: #10B981;
    --success-soft: rgba(16, 185, 129, 0.08);
    --danger: #E11D48;
    --r: 16px;
    --r-lg: 24px;
    --r-full: 9999px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.05);
    --safe-b: env(safe-area-inset-bottom, 0px);
    --safe-t: env(safe-area-inset-top, 0px);
    --font: 'Space Grotesk', -apple-system, system-ui, sans-serif;
    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset ---- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100dvh;
    overflow: hidden;
    overscroll-behavior: none;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    touch-action: manipulation;
}

body { position: fixed; width: 100%; }

#app {
    position: relative;
    width: 100%;
    height: 100dvh;
    overflow: hidden;
}

button, label, .quality-pills, .meta-strip, .screen-nav, .badge {
    user-select: none;
    -webkit-user-select: none;
}

/* ======================================================
   Screen System
   ====================================================== */

.screen {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    transform: translateX(105%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.45s var(--ease), opacity 0.35s var(--ease), visibility 0s 0.45s;
    will-change: transform, opacity;
    z-index: 1;
}

.screen.active {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    z-index: 2;
    transition: transform 0.45s var(--ease), opacity 0.35s var(--ease), visibility 0s 0s;
}

.screen.exit-left {
    transform: translateX(-25%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.45s var(--ease), opacity 0.35s var(--ease), visibility 0s 0.45s;
}

.screen-inner {
    flex: 1;
    padding: 0 24px;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.screen-inner::-webkit-scrollbar { width: 0; }

.scroll-y { padding-bottom: 100px; }

.center-v {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ---- Nav bar ---- */
.screen-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    padding-top: calc(8px + var(--safe-t));
    min-height: 52px;
    background: rgba(250, 248, 245, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-back {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border: none;
    background: var(--surface);
    color: var(--text);
    border-radius: var(--r-full);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s var(--spring);
}
.nav-back:active { transform: scale(0.88); }
.nav-back svg { width: 20px; height: 20px; }

.nav-title {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.nav-spacer { flex: 1; }

/* ---- Screen bottom ---- */
.screen-bottom {
    padding: 12px 24px;
    padding-bottom: calc(16px + var(--safe-b));
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* ======================================================
   Screen 1 — Select
   ====================================================== */

#screen-select .screen-inner {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding-top: calc(72px + var(--safe-t));
    padding-bottom: 24px;
    gap: 40px;
}

.select-top {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.badge {
    display: inline-flex;
    align-self: flex-start;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: var(--r-full);
}

.select-top h1 {
    font-size: clamp(40px, 10vw, 56px);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    color: var(--text);
}

.tagline {
    font-size: 16px;
    color: var(--text-2);
    max-width: 280px;
    line-height: 1.5;
}

/* ---- File Picker ---- */
.file-picker {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: var(--r-lg);
    cursor: pointer;
    background: var(--surface);
    border: 2px dashed var(--border-strong);
    box-shadow: var(--shadow);
    transition: transform 0.3s var(--spring), border-color 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}

.file-picker::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-soft) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.3s;
}

.file-picker:active {
    transform: scale(0.97);
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
}
.file-picker:active::before { opacity: 1; }

.file-picker.drag-over {
    border-color: var(--accent);
    border-style: solid;
    box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-lg);
}
.file-picker.drag-over::before { opacity: 1; }

.picker-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: 1;
}

.picker-icon {
    width: 56px;
    height: 56px;
    display: grid;
    place-items: center;
    background: var(--accent);
    color: white;
    border-radius: var(--r);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
    transition: transform 0.3s var(--spring);
}
.file-picker:active .picker-icon { transform: scale(1.08); }
.picker-icon svg { width: 28px; height: 28px; }

.picker-label {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
}

.picker-sub {
    font-size: 13px;
    color: var(--text-3);
}

/* ---- Engine loader ---- */
.engine-loader {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px 24px;
    padding-bottom: calc(16px + var(--safe-b));
    transition: opacity 0.3s, transform 0.3s;
}

.engine-loader.hidden {
    opacity: 0;
    transform: translateY(16px);
    pointer-events: none;
}

.engine-loader-label {
    font-size: 12px;
    color: var(--text-3);
    text-align: center;
    margin-bottom: 8px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.engine-loader-track {
    height: 3px;
    background: var(--surface-dim);
    border-radius: 2px;
    overflow: hidden;
}

.engine-loader-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.4s var(--ease);
}

/* ======================================================
   Screen 2 — Options
   ====================================================== */

.preview-card {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--r-lg);
    overflow: hidden;
    background: #000;
    box-shadow: var(--shadow-xl);
    margin-bottom: 20px;
}

.preview-card video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ---- Meta strip ---- */
.meta-strip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 14px 0;
    margin-bottom: 28px;
}

.meta-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
}

.meta-val {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.01em;
    font-variant-numeric: tabular-nums;
}

.meta-key {
    font-size: 11px;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
}

.meta-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--text-3);
    opacity: 0.5;
}

/* ---- Quality pills ---- */
.quality-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quality-pills {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.pill {
    flex: 1;
    min-width: 0;
    padding: 12px 8px;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--r);
    background: var(--surface);
    color: var(--text-2);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.25s var(--spring);
    box-shadow: var(--shadow-sm);
    text-align: center;
    white-space: nowrap;
}

.pill:active { transform: scale(0.94); }

.pill.active {
    background: var(--text);
    color: var(--surface);
    border-color: var(--text);
    box-shadow: var(--shadow);
}

.pill.accent.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.quality-hint {
    font-size: 14px;
    color: var(--text-3);
    line-height: 1.5;
    padding: 0 4px;
}

/* ======================================================
   Buttons
   ====================================================== */

.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 16px 24px;
    border: none;
    border-radius: var(--r);
    background: var(--text);
    color: var(--surface);
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: transform 0.2s var(--spring), box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(255,255,255,0.06), transparent);
    pointer-events: none;
}

.btn-primary:active {
    transform: scale(0.97) translateY(1px);
    box-shadow: var(--shadow);
}

.btn-primary:disabled {
    opacity: 0.4;
    pointer-events: none;
}

.btn-primary svg, .btn-ico { width: 18px; height: 18px; }

.btn-ghost {
    width: 100%;
    padding: 14px 24px;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--r);
    background: var(--surface);
    color: var(--text);
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s var(--spring);
}

.btn-ghost:active { transform: scale(0.97); }

.btn-ghost.danger {
    color: var(--danger);
    border-color: rgba(225, 29, 72, 0.2);
    background: rgba(225, 29, 72, 0.04);
}

.btn-text {
    width: 100%;
    padding: 10px 24px;
    border: none;
    background: none;
    color: var(--text-3);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
}
.btn-text:active { color: var(--text-2); }

/* ======================================================
   Screen 3 — Progress
   ====================================================== */

.progress-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.progress-ring-wrap {
    position: relative;
    width: 180px;
    height: 180px;
    display: grid;
    place-items: center;
}

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

.ring-bg {
    fill: none;
    stroke: var(--surface-dim);
    stroke-width: 5;
}

.ring-fill {
    fill: none;
    stroke: url(#ringGrad);
    stroke-width: 5;
    stroke-linecap: round;
    stroke-dasharray: 427.26;
    stroke-dashoffset: 427.26;
    transition: stroke-dashoffset 0.5s var(--ease);
}

.ring-label {
    position: absolute;
    display: flex;
    align-items: baseline;
}

.ring-pct {
    font-size: 52px;
    font-weight: 700;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
}

.ring-sym {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-3);
    margin-left: 2px;
}

.progress-msg {
    font-size: 15px;
    color: var(--text-3);
    font-weight: 500;
}

/* ======================================================
   Screen 4 — Done
   ====================================================== */

.done-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

.done-icon {
    width: 72px;
    height: 72px;
    animation: pop 0.5s var(--spring);
}
.done-icon svg { width: 100%; height: 100%; }

.size-compare {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    width: 100%;
    max-width: 260px;
}

.size-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    padding: 14px 20px;
    background: var(--surface);
    border-radius: var(--r);
    box-shadow: var(--shadow);
}

.size-row.result {
    background: var(--success-soft);
    box-shadow: none;
    border: 1.5px solid rgba(16, 185, 129, 0.2);
}

.size-label {
    font-size: 14px;
    color: var(--text-3);
    font-weight: 500;
}

.size-val {
    font-size: 14px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.size-row.result .size-val { color: var(--success); }

.size-arrow {
    width: 20px;
    height: 20px;
    color: var(--text-3);
    opacity: 0.4;
}
.size-arrow svg { width: 100%; height: 100%; }

.savings-badge {
    display: inline-flex;
    padding: 8px 20px;
    font-size: 15px;
    font-weight: 700;
    color: var(--success);
    background: var(--success-soft);
    border-radius: var(--r-full);
}

/* ======================================================
   Estimation
   ====================================================== */

.estimate-section {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.estimate-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background: var(--surface);
    border-radius: var(--r);
    box-shadow: var(--shadow-sm);
}

.estimate-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.estimate-label {
    font-size: 12px;
    color: var(--text-3);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.estimate-value {
    font-size: 18px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.estimate-tag {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 10px;
    border-radius: var(--r-full);
    background: var(--surface-dim);
    color: var(--text-3);
}

.estimate-tag.good {
    background: var(--success-soft);
    color: var(--success);
}

.btn-test {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--r);
    background: none;
    color: var(--text-2);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.2s var(--spring);
}

.btn-test:active {
    transform: scale(0.97);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-test:disabled {
    opacity: 0.4;
    pointer-events: none;
}

.btn-test svg {
    width: 16px;
    height: 16px;
}

.estimate-testing {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px;
    font-size: 13px;
    color: var(--text-3);
    font-weight: 500;
}

.mini-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--surface-dim);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ======================================================
   Screen 5 — About
   ====================================================== */

.about-content {
    padding-top: 16px;
    padding-bottom: 40px;
}

.about-content h2 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 20px;
}

.about-content h3 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 10px;
}

.about-content p {
    font-size: 15px;
    line-height: 1.65;
    color: var(--text-2);
    margin-bottom: 16px;
}

.about-divider {
    width: 40px;
    height: 3px;
    background: var(--surface-dim);
    border-radius: 2px;
    margin: 28px 0;
}

.about-link-ext {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 15px;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    padding: 10px 0;
    transition: opacity 0.2s;
}

.about-link-ext:active { opacity: 0.7; }

.about-link-ext svg {
    width: 16px;
    height: 16px;
}

.about-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.about-footer p {
    font-size: 14px;
    color: var(--text-3);
    font-style: italic;
}

/* ---- About link on home screen ---- */
.about-link {
    display: block;
    text-align: center;
    padding: 12px;
    border: none;
    background: none;
    color: var(--text-3);
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font);
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.about-link:active { color: var(--text-2); }

/* ======================================================
   Animations
   ====================================================== */

@keyframes pop {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

/* ======================================================
   Desktop
   ====================================================== */

@media (min-width: 640px) {
    #app {
        max-width: 440px;
        margin: 0 auto;
        box-shadow: -1px 0 0 var(--border), 1px 0 0 var(--border);
    }

    .file-picker:hover {
        border-color: var(--accent);
        box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-lg);
    }
    .file-picker:hover::before { opacity: 1; }
    .file-picker:hover .picker-icon { transform: scale(1.08); }

    .btn-primary:hover {
        box-shadow: var(--shadow-xl);
    }

    .pill:hover {
        border-color: var(--text-3);
    }
}

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