/* ============================================================
   QR Studio — Modern Dark / Light Theme
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
    --bg:            #09090f;
    --surface:       #111118;
    --surface-2:     #18182a;
    --surface-hover: #1e1e30;
    --border:        rgba(255, 255, 255, 0.07);
    --border-hover:  rgba(255, 255, 255, 0.13);
    --border-focus:  rgba(124, 58, 237, 0.65);
    --text:          #e2e8f0;
    --text-2:        #8892a4;
    --text-3:        #4a5568;
    --accent:        #7c3aed;
    --accent-2:      #3b82f6;
    --accent-glow:   rgba(124, 58, 237, 0.22);
    --gradient:      linear-gradient(135deg, #7c3aed 0%, #3b82f6 100%);
    --success:       #10b981;
    --success-bg:    rgba(16, 185, 129, 0.12);
    --error:         #ef4444;
    --error-bg:      rgba(239, 68, 68, 0.12);
    --radius-sm:     8px;
    --radius:        14px;
    --radius-lg:     22px;
    --font:          'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --panel-shadow:  0 0 0 1px rgba(255,255,255,0.05), 0 24px 60px rgba(0,0,0,0.45);
    --t:             0.2s ease;
}

[data-theme="light"] {
    --bg:            #eef0f7;
    --surface:       #ffffff;
    --surface-2:     #f5f7fc;
    --surface-hover: #eef0f7;
    --border:        rgba(0, 0, 0, 0.08);
    --border-hover:  rgba(0, 0, 0, 0.15);
    --border-focus:  rgba(124, 58, 237, 0.55);
    --text:          #0f172a;
    --text-2:        #475569;
    --text-3:        #94a3b8;
    --accent-glow:   rgba(124, 58, 237, 0.14);
    --panel-shadow:  0 0 0 1px rgba(0,0,0,0.06), 0 24px 60px rgba(0,0,0,0.09);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background var(--t), color var(--t);
    overflow-x: hidden;
}

/* ---------- Background Orbs ---------- */
.bg-orbs {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.18;
    animation: drift 12s ease-in-out infinite alternate;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #7c3aed, transparent 70%);
    top: -200px;
    right: -150px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #3b82f6, transparent 70%);
    bottom: -150px;
    left: -100px;
    animation-delay: -6s;
}

[data-theme="light"] .orb { opacity: 0.1; }

@keyframes drift {
    from { transform: translate(0, 0) scale(1); }
    to   { transform: translate(30px, 20px) scale(1.08); }
}

/* ---------- Header ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(9, 9, 15, 0.7);
    border-bottom: 1px solid var(--border);
    transition: background var(--t);
}

[data-theme="light"] .header {
    background: rgba(238, 240, 247, 0.75);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    color: var(--text);
    text-decoration: none;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--accent);
    flex-shrink: 0;
}

.logo-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--t);
    position: relative;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    color: var(--text);
    background: var(--surface-hover);
}

.theme-toggle svg { width: 18px; height: 18px; transition: var(--t); }

.icon-moon { display: none; }

[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ---------- Main & Hero ---------- */
.main {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.15;
    margin-bottom: 0.9rem;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-2);
    font-weight: 400;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ---------- App Grid ---------- */
.app-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

/* ---------- Panel ---------- */
.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--panel-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: background var(--t), border-color var(--t);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.panel-title {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-3);
}

/* ---------- Type Tabs ---------- */
.type-tabs {
    display: flex;
    gap: 0.3rem;
    background: var(--surface-2);
    border-radius: var(--radius-sm);
    padding: 3px;
    border: 1px solid var(--border);
}

.tab {
    padding: 0.3rem 0.7rem;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--text-2);
    font-family: var(--font);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--t);
    white-space: nowrap;
}

.tab:hover { color: var(--text); }

.tab.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

[data-theme="light"] .tab.active {
    box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}

/* ---------- Input Area ---------- */
.input-area {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.form-group { display: flex; flex-direction: column; gap: 0.45rem; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.input-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-2);
}

.optional {
    font-size: 0.72rem;
    color: var(--text-3);
    font-weight: 400;
}

.input-wrapper { position: relative; }

.input-icon {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-3);
    pointer-events: none;
    flex-shrink: 0;
}

.text-input {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.88rem;
    transition: var(--t);
    outline: none;
    resize: none;
}

.text-input.has-icon { padding-left: 2.5rem; }

.text-input::placeholder { color: var(--text-3); }

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

.text-input:focus {
    border-color: var(--border-focus);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.text-input.textarea { resize: vertical; min-height: 90px; line-height: 1.6; }

/* ---------- Checkbox ---------- */
.checkbox-group { justify-content: flex-end; }

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.83rem;
    color: var(--text-2);
    user-select: none;
    padding: 0.65rem 0.9rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--t);
    height: 38px;
}

.checkbox-label:hover {
    border-color: var(--border-hover);
    color: var(--text);
}

.checkbox-input { display: none; }

.checkbox-custom {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    border: 1.5px solid var(--border-hover);
    background: var(--surface);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--t);
}

.checkbox-input:checked + .checkbox-custom {
    background: var(--accent);
    border-color: var(--accent);
}

.checkbox-input:checked + .checkbox-custom::after {
    content: '';
    width: 8px;
    height: 5px;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg) translateY(-1px);
    display: block;
}

/* ---------- Divider ---------- */
.divider {
    height: 1px;
    background: var(--border);
    margin: 0 -1.75rem;
}

/* ---------- Section Label ---------- */
.section-label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: -0.25rem;
}

/* ---------- Customization Options ---------- */
.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.85rem;
}

.option-group { display: flex; flex-direction: column; gap: 0.45rem; }

.option-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-2);
}

/* Color picker */
.color-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.5rem 0.75rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--t);
    overflow: hidden;
}

.color-wrapper:hover { border-color: var(--border-hover); }

.color-swatch {
    width: 20px;
    height: 20px;
    border-radius: 5px;
    border: 1.5px solid rgba(255,255,255,0.15);
    flex-shrink: 0;
    pointer-events: none;
    position: relative;
    z-index: 1;
}

[data-theme="light"] .color-swatch { border-color: rgba(0,0,0,0.15); }

.color-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    border: none;
    padding: 0;
}

.color-hex {
    font-size: 0.78rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-2);
    pointer-events: none;
    position: relative;
    z-index: 1;
}

/* Select */
.select-input {
    width: 100%;
    padding: 0.6rem 0.85rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.83rem;
    cursor: pointer;
    outline: none;
    transition: var(--t);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6,9 12,15 18,9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.select-input:hover { border-color: var(--border-hover); }

.select-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ---------- Generate Button ---------- */
.generate-btn {
    width: 100%;
    padding: 0.85rem 1.5rem;
    background: var(--gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: var(--font);
    font-size: 0.92rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    transition: opacity var(--t), transform var(--t), box-shadow var(--t);
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.35);
    margin-top: 0.25rem;
}

.generate-btn svg { width: 17px; height: 17px; }

.generate-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 6px 28px rgba(124, 58, 237, 0.45);
}

.generate-btn:active { transform: translateY(0); }

/* ---------- Output Panel ---------- */
.output-panel { gap: 1.25rem; }

/* Status badge */
.status-badge {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 0.25rem 0.65rem;
    border-radius: 99px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-3);
    transition: var(--t);
    text-transform: uppercase;
}

.status-badge.success {
    background: var(--success-bg);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--success);
}

/* QR Display area */
.qr-display {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-2);
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    transition: var(--t);
}

/* Placeholder */
.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    text-align: center;
    padding: 2.5rem 1.5rem;
    color: var(--text-3);
    animation: fade-in 0.4s ease;
}

.placeholder-icon {
    width: 72px;
    height: 72px;
    margin-bottom: 0.25rem;
}

.placeholder-title {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-2);
}

.placeholder-sub {
    font-size: 0.8rem;
    color: var(--text-3);
}

/* QR Canvas container */
.qr-canvas {
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    animation: pop-in 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.qr-canvas img,
.qr-canvas canvas {
    border-radius: var(--radius-sm);
    box-shadow: 0 8px 40px rgba(0,0,0,0.4);
    max-width: 100%;
    height: auto;
    display: block;
}

[data-theme="light"] .qr-canvas img,
[data-theme="light"] .qr-canvas canvas {
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

/* ---------- Action Buttons ---------- */
.action-buttons {
    display: none;
    gap: 0.75rem;
    animation: fade-up 0.3s ease;
}

.action-btn {
    flex: 1;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-family: var(--font);
    font-size: 0.83rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--t);
}

.action-btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.action-btn.primary {
    background: var(--gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 2px 12px rgba(124, 58, 237, 0.3);
}

.action-btn.primary:hover {
    opacity: 0.88;
    transform: translateY(-1px);
    box-shadow: 0 4px 18px rgba(124, 58, 237, 0.4);
}

.action-btn.secondary {
    background: var(--surface-2);
    color: var(--text);
}

.action-btn.secondary:hover {
    background: var(--surface-hover);
    border-color: var(--border-hover);
}

.action-btn:active { transform: translateY(0) !important; }

/* ---------- Toast Notifications ---------- */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.75rem 1.1rem;
    border-radius: var(--radius-sm);
    font-size: 0.83rem;
    font-weight: 500;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: 0 8px 30px rgba(0,0,0,0.35);
    pointer-events: auto;
    opacity: 0;
    transform: translateY(12px) scale(0.97);
    transition: opacity 0.25s ease, transform 0.25s ease;
    max-width: 320px;
    backdrop-filter: blur(12px);
}

.toast.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.toast-icon { flex-shrink: 0; width: 18px; height: 18px; }

.toast-success .toast-icon { color: var(--success); }
.toast-error   .toast-icon { color: var(--error); }
.toast-info    .toast-icon { color: var(--accent); }

.toast-success { border-color: rgba(16, 185, 129, 0.25); }
.toast-error   { border-color: rgba(239, 68, 68, 0.25); }

/* ---------- Animations ---------- */
@keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

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

@keyframes pop-in {
    from { opacity: 0; transform: scale(0.88); }
    to   { opacity: 1; transform: scale(1); }
}

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
    .app-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 560px) {
    .main { padding: 2rem 1rem 4rem; }
    .panel { padding: 1.25rem; }

    .panel-header { gap: 0.75rem; }

    .type-tabs { gap: 0.2rem; overflow-x: auto; }
    .tab { padding: 0.3rem 0.55rem; font-size: 0.74rem; }

    .options-grid { grid-template-columns: 1fr; }

    .form-row { grid-template-columns: 1fr; }

    .action-buttons { flex-direction: column; }

    .hero-title { font-size: 1.9rem; }
}

@media (max-width: 360px) {
    .header-inner { padding: 0 1rem; }
    .logo-text { display: none; }
}