:root {
    /* Light Theme (Default) */
    color-scheme: light;
    --bg: #f6f8fc;
    --bg-gradient: radial-gradient(circle at 10% 20%, rgba(224, 94, 27, 0.05) 0%, transparent 40%),
                   radial-gradient(circle at 90% 80%, rgba(15, 118, 110, 0.06) 0%, transparent 40%),
                   linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    --panel: rgba(255, 255, 255, 0.72);
    --panel-strong: #ffffff;
    --panel-border: #c7d2e0;
    --control-border: #748297;
    --ink: #0f172a;
    --muted: #58677c;
    --line: #cbd5e1;
    --primary: #b54708;
    --primary-dark: #933809;
    --primary-light: rgba(181, 71, 8, 0.16);
    --primary-action: #b54708;
    --primary-action-hover: #933809;
    --on-primary: #ffffff;
    --secondary: #0f766e;
    --secondary-light: rgba(15, 118, 110, 0.12);
    --shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.06), 0 0 50px -10px rgba(15, 23, 42, 0.03);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
    
    --slider-track: #e2e8f0;
    --card-bg: rgba(255, 255, 255, 0.65);
    --card-selected-border: #0f766e;
    --card-selected-shadow: 0 12px 24px rgba(15, 118, 110, 0.08);
    --preview-stage-bg: #f8fafc;
    --preview-stage-grid-accent: #e2e8f0;
    --preview-stage-border: #748297;
    --meta-bg: rgba(255, 255, 255, 0.7);
    --btn-secondary-bg: #d9efec;
    --btn-secondary-hover: #c2e7e3;
    --error: #c62828;
}

[data-theme="dark"] {
    /* Dark Theme */
    color-scheme: dark;
    --bg: #080b11;
    --bg-gradient: radial-gradient(circle at 10% 20%, rgba(224, 94, 27, 0.12) 0%, transparent 45%),
                   radial-gradient(circle at 90% 80%, rgba(20, 184, 166, 0.1) 0%, transparent 45%),
                   linear-gradient(135deg, #090d16 0%, #05070a 100%);
    --panel: rgba(15, 23, 42, 0.65);
    --panel-strong: #1e293b;
    --panel-border: #475569;
    --control-border: #71839d;
    --ink: #f1f5f9;
    --muted: #a4b2c5;
    --line: #475569;
    --primary: #ff9a6b;
    --primary-dark: #ffb089;
    --primary-light: rgba(255, 154, 107, 0.2);
    --primary-action: #ff8a53;
    --primary-action-hover: #ff9a6b;
    --on-primary: #0f172a;
    --secondary: #14b8a6;
    --secondary-light: rgba(20, 184, 166, 0.2);
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4), 0 0 60px -15px rgba(0, 0, 0, 0.35);
    
    --slider-track: #334155;
    --card-bg: rgba(30, 41, 59, 0.45);
    --card-selected-border: #2dd4bf;
    --card-selected-shadow: 0 12px 24px rgba(20, 184, 166, 0.2);
    --preview-stage-bg: #090d16;
    --preview-stage-grid-accent: #1e293b;
    --preview-stage-border: #71839d;
    --meta-bg: rgba(30, 41, 59, 0.5);
    --btn-secondary-bg: #153c3a;
    --btn-secondary-hover: #1a4d4a;
    --error: #f87171;
}

* {
    box-sizing: border-box;
}

body,
.panel,
input,
select,
textarea,
.button,
.toggle-pill span,
.preset-card,
.result-meta div,
.preview-stage {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    line-height: 1.5;
}

::placeholder {
    color: var(--muted);
    opacity: 1;
}

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

.page-shell {
    width: min(1280px, calc(100% - 40px));
    margin: 0 auto;
    padding: 40px 0 60px;
}

/* Header layout */
.hero {
    margin-bottom: 32px;
}

.hero-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.75rem;
    font-weight: 700;
}

h1,
h2,
h3 {
    margin: 0;
    font-weight: 800;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.4rem, 4.5vw, 3.6rem);
    line-height: 1.1;
    color: var(--ink);
}

.tagline {
    max-width: 48rem;
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 1.05rem;
    font-weight: 400;
}

/* Theme Switcher Button */
.theme-toggle-wrapper {
    margin-top: 10px;
}

.theme-toggle-btn {
    position: relative;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid var(--control-border);
    background: var(--panel-strong);
    color: var(--ink);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: var(--shadow);
    padding: 0;
}

.theme-toggle-btn:focus-visible,
.button:focus-visible,
.toggle-pill input:focus-visible + span,
.preset-card:has(input:focus-visible),
input[type="color"]:focus-visible,
input[type="range"]:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
    box-shadow: 0 0 0 4px var(--primary-light);
}

.theme-toggle-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 10px 25px -10px rgba(0, 0, 0, 0.15);
}

.theme-toggle-btn svg {
    position: absolute;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s ease;
}

/* Light Theme: Sun is rotated and hidden; Moon is centered and visible */
.theme-toggle-btn .sun-icon {
    transform: rotate(90deg);
    opacity: 0;
}

.theme-toggle-btn .moon-icon {
    transform: rotate(0);
    opacity: 1;
}

/* Dark Theme: Sun is centered and visible; Moon is rotated and hidden */
[data-theme="dark"] .theme-toggle-btn .sun-icon {
    transform: rotate(0);
    opacity: 1;
}

[data-theme="dark"] .theme-toggle-btn .moon-icon {
    transform: rotate(-90deg);
    opacity: 0;
}

/* Panel layout styling */
.panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 32px;
}

.panel-head h2 {
    font-size: 1.6rem;
    font-weight: 700;
}

.panel-head p,
.section-head p,
.preview-placeholder p,
.field small {
    color: var(--muted);
    font-size: 0.92rem;
}

.workspace {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(360px, 0.75fr);
    gap: 32px;
}

.panel-head,
.section-head {
    margin-bottom: 24px;
}

.panel-head p,
.section-head p {
    margin: 6px 0 0;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.field {
    display: grid;
    gap: 8px;
    margin-bottom: 20px;
}

.field span {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--ink);
}

input,
select,
textarea,
.button {
    font-family: inherit;
    font-size: 0.95rem;
}

/* Inputs & Form Fields Styling */
input[type="text"],
input[type="url"],
input[type="email"],
input[type="tel"],
input[type="file"],
select,
textarea {
    width: 100%;
    border: 1px solid var(--control-border);
    border-radius: var(--radius-sm);
    background: var(--panel-strong);
    color: var(--ink);
    padding: 12px 16px;
    outline: none;
    box-sizing: border-box;
}

input[type="text"]:focus,
input[type="url"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Color input custom styling */
.color-picker-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.color-picker-group input[type="text"] {
    max-width: 110px;
    text-transform: uppercase;
}

.checkbox-inline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 500;
    user-select: none;
    margin-left: 10px;
    white-space: nowrap;
}

.checkbox-inline input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--primary);
    cursor: pointer;
}

.url-shortener-panel {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin: -4px 0 16px;
}

.url-shortener-panel.is-disabled {
    opacity: 0.7;
}

.is-hidden {
    display: none !important;
}

.shortener-toggle {
    margin-left: 0;
}

.button-inline {
    padding: 10px 18px;
}

input[readonly] {
    opacity: 1;
    background: var(--meta-bg);
}

.logo-options-panel {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px dashed var(--line);
    display: none;
}

.logo-options-panel.is-active {
    display: block;
}

input[type="color"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 2px solid var(--control-border);
    border-radius: 50%;
    cursor: pointer;
    overflow: hidden;
    background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
}

input[type="color"]::-moz-color-swatch {
    border: none;
    border-radius: 50%;
}

input[type="color"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Custom Range Input */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: var(--slider-track);
    outline: none;
    margin: 12px 0 8px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid var(--panel-strong);
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    cursor: pointer;
    transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid var(--panel-strong);
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    cursor: pointer;
    transition: transform 0.1s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
}

textarea {
    resize: vertical;
}

.section-block {
    margin-top: 26px;
    padding-top: 26px;
    border-top: 1px solid var(--line);
}

.mode-panel,
.logo-source-panel {
    display: none;
}

.mode-panel.is-active,
.logo-source-panel.is-active {
    display: block;
}

.checkbox-field {
    align-content: start;
}

.checkbox-field input {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    accent-color: var(--primary);
    cursor: pointer;
}

.checkbox-field span {
    font-weight: 500;
}

/* Toggle row segment switcher */
.toggle-row {
    display: inline-flex;
    background: var(--slider-track);
    padding: 4px;
    border-radius: 999px;
    gap: 2px;
    margin-bottom: 22px;
    border: 1px solid var(--control-border);
}

.toggle-pill {
    position: relative;
    cursor: pointer;
}

.toggle-pill input {
    position: absolute;
    opacity: 0;
    inset: 0;
    cursor: pointer;
}

.toggle-pill span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 110px;
    padding: 8px 16px;
    font-size: 0.88rem;
    font-weight: 500;
    border-radius: 999px;
    color: var(--muted);
    transition: all 0.2s ease;
}

.toggle-pill input:checked + span {
    background: var(--panel-strong);
    color: var(--ink);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    font-weight: 600;
}

/* Preset Logos Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 16px;
}

.preset-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 16px 12px;
    border: 1px solid var(--control-border);
    border-radius: var(--radius-md);
    background: var(--card-bg);
    cursor: pointer;
}

.preset-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: contain;
    padding: 10px;
    border-radius: var(--radius-sm);
    background: #ffffff;
    border: 1px solid var(--line);
}

.preset-card input {
    position: absolute;
    opacity: 0;
}

.preset-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
}

.preset-card.is-selected,
.preset-card:has(input:checked) {
    border-color: var(--card-selected-border);
    transform: translateY(-4px);
    box-shadow: var(--card-selected-shadow);
}

.preset-card span {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--ink);
    text-align: center;
}

/* Buttons and actions */
.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 28px;
}

.button {
    border: 0;
    border-radius: 999px;
    padding: 12px 28px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
}

.button-primary {
    background: var(--primary-action);
    color: var(--on-primary);
}

.button-primary:hover:not(:disabled) {
    background: var(--primary-action-hover);
}

.button-secondary {
    background: var(--btn-secondary-bg);
    color: var(--secondary);
}

.button-secondary:hover:not(:disabled) {
    background: var(--btn-secondary-hover);
}

.download-option {
    margin-left: 2px;
    font-weight: 600;
}

.form-message {
    min-height: 1.5rem;
    margin: 16px 0 0;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Preview Panel */
.preview-panel {
    display: flex;
    flex-direction: column;
    align-self: start;
    gap: 24px;
}

.preview-stage {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: 24px;
    border-radius: var(--radius-lg);
    background-color: var(--preview-stage-bg);
    background-image:
        linear-gradient(45deg, var(--preview-stage-grid-accent) 25%, transparent 25%, transparent 75%, var(--preview-stage-grid-accent) 75%),
        linear-gradient(45deg, var(--preview-stage-grid-accent) 25%, var(--preview-stage-bg) 25%, var(--preview-stage-bg) 75%, var(--preview-stage-grid-accent) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    border: 2px dashed var(--preview-stage-border);
    overflow: hidden;
}

.preview-stage img {
    width: 100%;
    max-width: 320px;
    height: auto;
    aspect-ratio: 1;
    object-fit: contain;
    animation: rise-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-radius: 12px;
}

.preview-placeholder {
    text-align: center;
    padding: 20px;
}

.preview-placeholder strong {
    display: block;
    font-size: 1.15rem;
    margin-bottom: 8px;
    color: var(--ink);
}

/* Metadata lists */
.result-meta {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 0;
}

.result-meta div {
    padding: 14px;
    border-radius: var(--radius-md);
    background: var(--meta-bg);
    border: 1px solid var(--control-border);
    text-align: center;
}

.result-meta dt {
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.result-meta dd {
    margin: 0;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--ink);
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (max-width: 980px) {
    .workspace {
        grid-template-columns: 1fr;
    }
    
    .hero-container {
        flex-direction: row;
        align-items: center;
    }
}

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

    .result-meta {
        grid-template-columns: 1fr;
    }
    
    .hero-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .theme-toggle-wrapper {
        align-self: flex-end;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}