/* ============================================
   GIF Color Adjuster
   Primary: #e67e22 (cinematic orange)
   Light default, dark mode via [data-theme="dark"]
   ============================================ */

:root {
    --primary:       #e67e22;
    --primary-light: rgba(230,126,34,0.12);
    --primary-dark:  #ca6f1e;

    --bg:            #fdf8f3;
    --bg-elevated:   #ffffff;
    --bg-secondary:  #faf4ec;
    --bg-tertiary:   #f4e9d8;

    --text:          #2c1a08;
    --text-secondary:#5a3e25;
    --text-muted:    #8d6840;

    --border:        #e8d5bc;
    --border-light:  #f4e9d8;

    --danger:        #e64e4e;
    --danger-light:  #fee2e2;

    --shadow-sm:     0 1px 3px rgba(0,0,0,0.07);
    --shadow-md:     0 4px 12px rgba(0,0,0,0.09);
    --shadow-lg:     0 10px 25px rgba(0,0,0,0.09);
    --shadow-xl:     0 20px 40px rgba(0,0,0,0.08);
    --shadow-primary:0 4px 14px rgba(230,126,34,0.28);
    --shadow-primary-hover:0 6px 20px rgba(230,126,34,0.38);

    --radius-sm:  6px;
    --radius-md:  12px;
    --radius-lg:  16px;
    --radius-xl:  24px;
    --radius-full:9999px;

    --input-bg:    #ffffff;
    --input-border:#e8d5bc;
    --checker-a:   #f5ece0;
    --checker-b:   #ecdfc9;
    --transition:  0.25s;
}

[data-theme="dark"] {
    --primary:       #f0953a;
    --primary-light: rgba(240,149,58,0.15);
    --primary-dark:  #d4801e;

    --bg:            #1a0f04;
    --bg-elevated:   #251508;
    --bg-secondary:  #30200e;
    --bg-tertiary:   #3d2c18;

    --text:          #f5ead8;
    --text-secondary:#c9a87a;
    --text-muted:    #8d6840;

    --border:        #3d2c18;
    --border-light:  #30200e;

    --danger:        #f87171;
    --danger-light:  rgba(248,113,113,0.15);

    --shadow-sm:     0 1px 3px rgba(0,0,0,0.4);
    --shadow-md:     0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg:     0 10px 25px rgba(0,0,0,0.5);
    --shadow-xl:     0 20px 40px rgba(0,0,0,0.6);
    --shadow-primary:0 4px 14px rgba(240,149,58,0.2);
    --shadow-primary-hover:0 6px 20px rgba(240,149,58,0.3);

    --input-bg:    #30200e;
    --input-border:#3d2c18;
    --checker-a:   #30200e;
    --checker-b:   #3d2c18;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    transition: background-color var(--transition), color var(--transition);
}

/* ─── Container ─────────────────────────────────── */
.tool-container { max-width: 1060px; margin: 0 auto; padding: 2rem; }

/* ─── Header ─────────────────────────────────────── */
.tool-header { text-align: center; margin-bottom: 2rem; }

.tool-title-row {
    display: flex; align-items: center; justify-content: center;
    gap: 1rem; margin-bottom: 1rem;
}
.tool-icon-wrapper {
    width: 64px; height: 64px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    color: white; box-shadow: var(--shadow-primary); flex-shrink: 0;
}
.tool-icon-wrapper svg, .tool-icon-wrapper i { width: 28px; height: 28px; }

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700; margin: 0;
    color: var(--primary); letter-spacing: -0.02em;
}
.tool-description {
    font-size: 1.05rem; color: var(--text-secondary);
    max-width: 800px; margin: 0 auto; line-height: 1.7;
}
.tool-description a { color: var(--primary); text-decoration: none; }
.tool-description a:hover { text-decoration: underline; }

/* ─── Tool Card ──────────────────────────────────── */
.tool-main {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    overflow: hidden;
    margin-bottom: 2rem;
    transition: background-color var(--transition), border-color var(--transition);
}

/* ─── Upload ─────────────────────────────────────── */
.upload-section { padding: 3rem; }

.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center; cursor: pointer;
    transition: all 0.3s; background: var(--bg-secondary);
    position: relative; overflow: hidden;
}
.upload-area::before {
    content: ''; position: absolute; inset: 0;
    background: var(--primary-light); opacity: 0; transition: opacity 0.3s;
}
.upload-area:hover, .upload-area.drag-over {
    border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-md);
}
.upload-area:hover::before, .upload-area.drag-over::before { opacity: 1; }

.upload-content { position: relative; z-index: 1; }
.upload-icon { color: var(--primary); margin-bottom: 1.5rem; transition: transform 0.3s; }
.upload-area:hover .upload-icon { transform: translateY(-6px); }
.upload-title { font-size: 1.4rem; font-weight: 600; margin: 0 0 0.5rem; color: var(--text); }
.upload-subtitle { color: var(--text-secondary); margin: 0 0 1rem; }

.file-types { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; margin-bottom: 1rem; }
.file-type-badge {
    background: var(--primary-light); color: var(--primary);
    padding: 0.3rem 0.8rem; border-radius: var(--radius-full);
    font-size: 0.8rem; font-weight: 600;
}
.upload-hint { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--text-muted); font-size: 0.875rem; }

/* ─── File Info Bar ──────────────────────────────── */
.file-info-bar {
    display: flex; flex-wrap: wrap; gap: 1.25rem;
    padding: 0.875rem 1.5rem;
    background: var(--bg-secondary); border-bottom: 1px solid var(--border);
}
.file-info-item { display: flex; align-items: center; gap: 0.45rem; font-size: 0.875rem; }
.file-info-item svg, .file-info-item i { color: var(--primary); }

/* ─── Editor Grid ────────────────────────────────── */
.editor-grid { display: grid; grid-template-columns: 1fr 1.1fr; }

.preview-col {
    padding: 1.5rem;
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column; gap: 1rem;
}

.controls-col {
    padding: 1.5rem;
    overflow-y: auto; max-height: 700px;
    display: flex; flex-direction: column; gap: 1rem;
}

/* ─── Panel Header ───────────────────────────────── */
.panel-header {
    display: flex; align-items: center; justify-content: space-between;
}
.panel-header h3 {
    display: flex; align-items: center; gap: 0.65rem;
    font-size: 1rem; font-weight: 600; margin: 0; color: var(--text);
}
.panel-header h3 svg, .panel-header h3 i { color: var(--primary); }

/* ─── Preview Toggle ─────────────────────────────── */
.preview-toggle {
    display: flex; gap: 0.3rem;
    background: var(--bg-secondary);
    padding: 0.25rem; border-radius: var(--radius-full);
}
.ptoggle {
    padding: 0.3rem 0.85rem; border: none;
    border-radius: var(--radius-full); background: transparent;
    color: var(--text-muted); font-size: 0.8rem; font-weight: 500;
    cursor: pointer; transition: all 0.2s;
}
.ptoggle.active { background: var(--primary); color: white; }
.ptoggle:hover:not(.active) { color: var(--text); }

/* ─── Canvas Wrap ────────────────────────────────── */
.canvas-wrap {
    position: relative;
    background-image:
        linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
        linear-gradient(-45deg,var(--checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%,  var(--checker-a) 75%),
        linear-gradient(-45deg,transparent 75%,  var(--checker-a) 75%);
    background-size: 14px 14px;
    background-position: 0 0, 0 7px, 7px -7px, -7px 0;
    background-color: var(--checker-b);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    overflow: hidden;
    min-height: 180px;
    display: flex; align-items: center; justify-content: center;
}

.preview-canvas {
    display: block;
    max-width: 100%; max-height: 300px;
    object-fit: contain;
    image-rendering: pixelated;
}

.canvas-placeholder {
    display: flex; flex-direction: column; align-items: center;
    gap: 0.75rem; color: var(--text-muted); padding: 2rem;
    text-align: center;
}
.canvas-placeholder p { margin: 0; font-size: 0.875rem; }

/* ─── Animated Strip ─────────────────────────────── */
.anim-strip {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.anim-label {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem; font-weight: 500; color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
.anim-label svg, .anim-label i { color: var(--primary); }
.anim-img {
    display: block; max-width: 100%; max-height: 160px;
    margin: 0 auto; padding: 0.5rem;
    object-fit: contain;
}

.preview-note {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-size: 0.72rem; color: var(--text-muted); margin: 0;
}
.preview-note svg, .preview-note i { flex-shrink: 0; }

/* ─── Control Groups ─────────────────────────────── */
.ctrl-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
}
.ctrl-group-title {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 0.78rem; font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.06em;
    margin-bottom: 0.875rem;
}
.ctrl-group-title svg, .ctrl-group-title i { color: var(--primary); }

/* ─── Presets ─────────────────────────────────────── */
.presets-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.4rem; }
.preset-btn {
    padding: 0.45rem 0.4rem;
    border: 1px solid var(--border); border-radius: var(--radius-md);
    background: var(--bg-elevated); color: var(--text);
    font-size: 0.75rem; font-weight: 500; cursor: pointer;
    transition: all 0.2s; white-space: nowrap; text-align: center;
}
.preset-btn:hover { border-color: var(--primary); color: var(--primary); }
.preset-btn.active { background: var(--primary); border-color: var(--primary); color: white; }

/* ─── Sliders ─────────────────────────────────────── */
.ctrl-row { margin-bottom: 0.875rem; }
.ctrl-row:last-child { margin-bottom: 0; }
.mt-sm { margin-top: 0.5rem; }

.ctrl-label {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 0.4rem; font-size: 0.85rem; font-weight: 500; color: var(--text);
}
.ctrl-hint { font-size: 0.75rem; color: var(--text-muted); font-weight: 400; }

.ctrl-val-wrap { display: flex; align-items: center; gap: 0.3rem; }
.ctrl-val { min-width: 28px; text-align: right; font-weight: 600; font-size: 0.82rem; color: var(--primary); }

.btn-reset1 {
    display: inline-flex; align-items: center;
    padding: 0.15rem; border: none;
    background: transparent; color: var(--text-muted);
    cursor: pointer; border-radius: var(--radius-sm);
    transition: color 0.15s;
}
.btn-reset1:hover { color: var(--primary); }

.cslider {
    width: 100%; height: 5px;
    border-radius: var(--radius-full);
    background: var(--border);
    appearance: none; -webkit-appearance: none;
    cursor: pointer; outline: none;
}
.cslider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px; height: 16px; border-radius: 50%;
    background: var(--primary); cursor: pointer;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    transition: transform 0.15s;
}
.cslider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.cslider::-moz-range-thumb {
    width: 16px; height: 16px; border-radius: 50%;
    background: var(--primary); border: none;
}

.temp-track  { background: linear-gradient(to right, #7ab0d4, #d4b87a); }
.tint-track  { background: linear-gradient(to right, #6fb56f, #d47ab0); }

.track-labels { display: flex; justify-content: space-between; font-size: 0.7rem; color: var(--text-muted); margin-top: 0.2rem; }

/* ─── Color Grading Wheels ─────────────────────────── */
.grade-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.grade-block { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.grade-block-title { font-size: 0.78rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

.hue-ring-wrap { position: relative; width: 80px; height: 80px; cursor: crosshair; }
.hue-ring { display: block; cursor: crosshair; border-radius: 50%; }

.hue-ring-dot {
    position: absolute;
    width: 14px; height: 14px;
    border-radius: 50%;
    border: 2px solid white;
    background: var(--primary);
    box-shadow: 0 1px 4px rgba(0,0,0,0.35);
    pointer-events: none;
    transition: background 0.1s;
}

/* ─── Footer Reset ─────────────────────────────────── */
.ctrl-footer { display: flex; justify-content: flex-end; padding-top: 0.25rem; }
.btn-reset-all {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--border); border-radius: var(--radius-full);
    background: transparent; color: var(--text-muted);
    font-size: 0.8rem; cursor: pointer; transition: all 0.2s;
}
.btn-reset-all:hover { border-color: var(--primary); color: var(--primary); }

/* ─── Action Bar ─────────────────────────────────── */
.action-bar {
    display: flex; justify-content: center; gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

/* ─── Buttons ─────────────────────────────────────── */
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.8rem 1.6rem; border-radius: var(--radius-full);
    font-size: 0.95rem; font-weight: 600; cursor: pointer;
    transition: all 0.2s; text-decoration: none; border: none;
}
.btn svg, .btn i { width: 18px; height: 18px; }
.btn-primary { background: var(--primary); color: white; box-shadow: var(--shadow-primary); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-primary-hover); }
.btn-secondary { background: var(--bg-elevated); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-secondary); border-color: var(--text-muted); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: white; }

/* ─── Result ─────────────────────────────────────── */
.result-section { padding: 3rem; text-align: center; }
.result-inner { max-width: 600px; margin: 0 auto; }
.result-icon { color: var(--primary); margin-bottom: 1rem; }
.result-title { font-size: 1.6rem; font-weight: 700; color: var(--text); margin: 0 0 0.4rem; }
.result-sub { color: var(--text-secondary); margin: 0 0 1.5rem; }

.result-preview-wrap {
    background-image:
        linear-gradient(45deg,var(--checker-a) 25%,transparent 25%),
        linear-gradient(-45deg,var(--checker-a) 25%,transparent 25%),
        linear-gradient(45deg,transparent 75%,var(--checker-a) 75%),
        linear-gradient(-45deg,transparent 75%,var(--checker-a) 75%);
    background-size: 14px 14px;
    background-position: 0 0, 0 7px, 7px -7px, -7px 0;
    background-color: var(--checker-b);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 1rem; margin-bottom: 1.25rem; overflow: hidden;
}
.result-preview-wrap img { max-width: 100%; max-height: 280px; object-fit: contain; display: block; margin: 0 auto; }

.result-meta { display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.meta-item { display: flex; align-items: center; gap: 0.45rem; font-size: 0.875rem; color: var(--text-secondary); }
.meta-item svg, .meta-item i { color: var(--primary); }

.result-btns { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: nowrap; }
.result-btns .btn { padding: 0.8rem 1.1rem; }

/* ─── Processing ─────────────────────────────────── */
.processing-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.72);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center; z-index: 1000;
}
.processing-box {
    background: var(--bg-elevated); padding: 2.5rem;
    border-radius: var(--radius-xl); text-align: center;
    max-width: 340px; box-shadow: var(--shadow-xl); width: 90%;
}
.proc-spinner {
    width: 54px; height: 54px;
    border: 4px solid var(--border); border-top-color: var(--primary);
    border-radius: 50%; margin: 0 auto 1.25rem;
    animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.proc-title { font-size: 1.1rem; font-weight: 600; color: var(--text); margin: 0 0 0.35rem; }
.proc-sub   { font-size: 0.85rem; color: var(--text-muted); margin: 0 0 1.25rem; min-height: 1.3em; }
.proc-bar-wrap { height: 7px; background: var(--border); border-radius: var(--radius-full); overflow: hidden; margin-bottom: 0.5rem; }
.proc-bar { height: 100%; background: var(--primary); border-radius: var(--radius-full); transition: width 0.2s linear; width: 0%; }
.proc-pct { font-size: 0.78rem; color: var(--text-muted); margin: 0; }

/* ─── Related Tools ───────────────────────────────── */
.gca-related-tools {
    margin-bottom: 2rem;
}

.gca-related-tools-box {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.gca-related-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
    white-space: nowrap;
}

.gca-related-label i {
    color: var(--primary);
}

.gca-related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.gca-related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--transition-speed);
}

.gca-related-link:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.gca-related-link i {
    width: 15px;
    height: 15px;
}

/* ─── Info Sections ───────────────────────────────── */
.gca-info-sections {
    margin-bottom: 2rem;
}

.gca-info-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
}

.gca-info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 1.25rem;
}

.gca-info-card h2 i {
    color: var(--primary);
}

.gca-info-card p {
    color: var(--text-muted);
    line-height: 1.7;
    margin: 0 0 1rem;
}

.gca-info-card p:last-child {
    margin-bottom: 0;
}

.gca-info-card a {
    color: var(--primary);
    text-decoration: none;
}

.gca-info-card a:hover {
    text-decoration: underline;
}

/* Features grid inside info card */
.gca-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin: 1.25rem 0;
}

.gca-feature-item {
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.gca-feature-item i {
    color: var(--primary);
    margin-bottom: 0.75rem;
    display: block;
}

.gca-feature-item h4 {
    margin: 0 0 0.375rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
}

.gca-feature-item h4 a {
    color: var(--primary);
    text-decoration: none;
}

.gca-feature-item h4 a:hover {
    text-decoration: underline;
}

.gca-feature-item p {
    font-size: 0.85rem;
    margin: 0;
    line-height: 1.5;
    color: var(--text-muted);
}

/* ─── FAQ ─────────────────────────────────────────── */
.gca-faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gca-faq-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.gca-faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    transition: background-color var(--transition-speed);
    gap: 1rem;
}

.gca-faq-question:hover {
    background: var(--bg-tertiary);
}

.gca-faq-question i {
    color: var(--text-muted);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

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

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

.gca-faq-answer {
    display: none;
    padding: 0 1.25rem 1rem;
}

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

.gca-faq-answer p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

.gca-faq-answer a {
    color: var(--primary);
    text-decoration: none;
}

.gca-faq-answer a:hover {
    text-decoration: underline;
}

/* ─── Toasts ─────────────────────────────────────── */
.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.875rem 1.1rem;
    border-radius: var(--radius-md);
    max-width: 380px;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(16px); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}

.toast-error {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.toast-info {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text);
}

.toast-body { font-size: 0.875rem; line-height: 1.5; }
.toast-body small { font-size: 0.8rem; opacity: 0.85; }
.toast-body a { color: inherit; }
.toast button {
    background: transparent;
    border: none;
    cursor: pointer;
    color: inherit;
    opacity: 0.55;
    padding: 0;
    flex-shrink: 0;
    transition: opacity 0.2s;
}
.toast button:hover { opacity: 1; }

/* ─── Responsive ─────────────────────────────────── */
@media (max-width: 860px) {
    .editor-grid { grid-template-columns: 1fr; }
    .preview-col { border-right: none; border-bottom: 1px solid var(--border); }
    .controls-col { max-height: none; }
    .gca-features-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
    .tool-container { padding: 1rem; }
    .upload-section { padding: 1.5rem; }
    .presets-grid { grid-template-columns: repeat(2, 1fr); }
    .grade-row { grid-template-columns: 1fr 1fr; }
    .action-bar { flex-direction: column; }
    .action-bar .btn { width: 100%; justify-content: center; }
    .result-btns { flex-direction: column; }
    .result-btns .btn { width: 100%; justify-content: center; }
    .toast { left: 1rem; right: 1rem; max-width: none; }
    .gca-info-card { padding: 1.25rem; }
}