:root {
    --bg-deep: #080808;
    --bg-surface: #101010;
    --bg-card: #161616;
    --bg-pill: #1C1C1C;
    --border-subtle: #222222;
    --border-active: #333333;
    --text-primary: #FFFFFF;
    --text-secondary: #888888;
    --accent: #3F8CFF;
    --accent-glow: rgba(63, 140, 255, 0.2);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-direction: column;
    padding: 2rem;
    padding-top: 180px; /* Stronger offset for maximum clarity */
}

.divider-v {
    width: 1px;
    height: 16px;
    background: var(--border-active);
    margin: 0 0.5rem;
}

.app-container {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    margin-bottom: 2rem;
}

.tool-tag {
    background: rgba(63, 140, 255, 0.1);
    color: var(--accent);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    font-weight: 900;
    letter-spacing: 2px;
    font-size: 0.65rem;
    border: 1px solid rgba(63, 140, 255, 0.2);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Main Workspace Layout */
.workspace {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 4rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.7);
}

.drop-zone {
    border: 1px dashed var(--border-active);
    border-radius: var(--radius-md);
    padding: 5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.01);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover {
    border-color: var(--accent);
    background: rgba(63, 140, 255, 0.04);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    width: 32px;
    height: 32px;
    color: var(--accent);
}

.drop-zone h3 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.5px; }
.drop-zone p { color: var(--text-secondary); font-size: 1rem; opacity: 0.8; }

.controls-bar {
    display: flex;
    justify-content: center;
    margin-top: 1.5rem;
}

.divider-v {
    width: 1px;
    height: 16px;
    background: var(--border-active);
    margin: 0 0.5rem;
}

/* Glassmorphic Settings Overlay */
.settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.settings-overlay.hidden {
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(0px);
}

.settings-overlay.hidden .config-card {
    transform: scale(0.95) translateY(10px);
}

.config-card {
    background: rgba(24, 24, 24, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 32px;
    width: 100%;
    max-width: 640px;
    padding: 3rem;
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.config-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.config-header h2 { font-size: 1.8rem; font-weight: 800; letter-spacing: -0.8px; margin-bottom: 0.4rem; }
.config-header p { color: var(--text-secondary); font-size: 0.95rem; }

.btn-circular {
    background: rgba(255, 255, 255, 0.05);
    border: none;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-circular:hover { background: rgba(255, 255, 255, 0.1); color: white; transform: rotate(90deg); }

.config-body {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.config-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.config-section > label {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.config-field {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: all 0.2s;
}

.config-field:focus-within {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--accent);
}

.config-field i { width: 20px; height: 20px; color: var(--text-secondary); opacity: 0.6; flex-shrink: 0; }
.config-field.full-width { grid-column: span 2; }

.field-info { display: flex; flex-direction: column; gap: 0.2rem; flex: 1; }
.field-info span { font-size: 0.75rem; font-weight: 600; color: var(--text-secondary); }
.field-info input {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    outline: none;
    width: 100%;
}

.unit-box { display: flex; align-items: baseline; gap: 0.5rem; }
.unit-box small { font-size: 0.8rem; font-weight: 700; color: var(--text-secondary); opacity: 0.5; }

/* Toggles */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toggle-control {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    padding: 1.25rem 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.toggle-label { display: flex; align-items: center; gap: 1.25rem; }
.toggle-label i { width: 22px; height: 22px; color: var(--accent); opacity: 0.8; }
.toggle-label div { display: flex; flex-direction: column; }
.toggle-label strong { font-size: 1rem; font-weight: 700; }
.toggle-label small { font-size: 0.8rem; color: var(--text-secondary); }

/* iOS Switch Styling */
.ios-switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.ios-switch input { opacity: 0; width: 0; height: 0; }
.ios-slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(255,255,255,0.1); transition: .4s; border-radius: 34px; }
.ios-slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
input:checked + .ios-slider { background-color: var(--accent); }
input:checked + .ios-slider:before { transform: translateX(20px); }

.config-footer { display: flex; justify-items: center; }
.config-footer .btn-primary { width: 100%; padding: 1.25rem; font-size: 1rem; }

/* File List & Items */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 480px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.file-list::-webkit-scrollbar { width: 4px; }
.file-list::-webkit-scrollbar-thumb { background: var(--border-active); border-radius: 10px; }

.file-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    cursor: grab;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.file-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
    transform: translateX(4px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.file-preview {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
}

.file-preview-img { width: 100%; height: 100%; object-fit: cover; }
.file-preview-icon { width: 20px; height: 20px; color: var(--accent); opacity: 0.7; }

.file-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.file-name { font-size: 0.95rem; font-weight: 700; color: white; }
.file-size { font-size: 0.8rem; color: var(--text-secondary); opacity: 0.6; }

.remove-file {
    background: rgba(255, 77, 77, 0.05);
    border: none;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    opacity: 0;
}

.file-item:hover .remove-file { opacity: 1; }
.remove-file:hover { background: #FF4D4D; color: white; transform: rotate(90deg); }
.remove-file i { width: 14px; height: 14px; }

/* Buttons & Rest */
.btn-primary {
    background: linear-gradient(135deg, #3F8CFF 0%, #2A7BFF 100%);
    color: white;
    padding: 1.2rem 4rem;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 60px;
    box-shadow: 0 10px 40px rgba(63, 140, 255, 0.35);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: none;
    cursor: pointer;
    letter-spacing: -0.2px;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 20px 50px rgba(63, 140, 255, 0.5);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.15;
    cursor: not-allowed;
    background: #333;
    box-shadow: none;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    gap: 0.5rem;
    color: var(--text-secondary);
    opacity: 0.6;
}

.empty-state p { font-size: 1rem; font-weight: 600; }
.empty-state small { font-size: 0.85rem; }

.btn-ghost { 
    background: transparent; 
    color: var(--text-secondary); 
    padding: 0.6rem 1.2rem; 
    border-radius: 12px; 
    display: flex; 
    align-items: center; 
    gap: 0.6rem; 
    font-size: 0.85rem; 
    font-weight: 600; 
    border: 1px solid transparent;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-ghost:hover { color: white; background: rgba(255, 255, 255, 0.05); border-color: rgba(255, 255, 255, 0.1); }
.btn-ghost i { width: 16px; height: 16px; }

/* Modal */
/* Full Page Drop Overlay */
.full-drop-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(63, 140, 255, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 5000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    pointer-events: none;
}

.full-drop-overlay.hidden { opacity: 0; visibility: hidden; }
.full-drop-overlay.active { opacity: 1; visibility: visible; pointer-events: auto; }

.drop-msg-card {
    background: var(--bg-surface);
    border: 2px dashed var(--accent);
    border-radius: 40px;
    padding: 4rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    box-shadow: 0 50px 100px rgba(0,0,0,0.5);
    transform: scale(0.9);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.full-drop-overlay.active .drop-msg-card { transform: scale(1); }

.drop-msg-card i { width: 80px; height: 80px; color: var(--accent); opacity: 0.8; }
.drop-msg-card h3 { font-size: 2rem; font-weight: 800; letter-spacing: -1px; }
.drop-msg-card p { color: var(--text-secondary); font-size: 1.1rem; }
/* Custom Dialog Overlay */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 4000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.dialog-overlay.hidden { opacity: 0; pointer-events: none; }
.dialog-overlay.hidden .dialog-card { transform: scale(0.9) translateY(20px); }

.dialog-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 28px;
    padding: 2.5rem;
    width: 100%;
    max-width: 380px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    box-shadow: 0 30px 60px rgba(0,0,0,0.6);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.dialog-icon-box {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.5rem;
}

.dialog-icon-box i { width: 28px; height: 28px; color: var(--accent); }
.dialog-card h3 { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.5px; }
.dialog-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.5; }

.dialog-actions {
    display: flex;
    width: 100%;
    gap: 0.75rem;
    margin-top: 1rem;
}

.dialog-actions .btn { flex: 1; padding: 0.9rem; font-size: 0.9rem; border-radius: 16px; font-weight: 700; border: none; cursor: pointer; transition: all 0.2s; }

.btn-secondary { background: rgba(255, 255, 255, 0.05); color: var(--text-secondary); }
.btn-secondary:hover { background: rgba(255, 255, 255, 0.1); color: white; }

/* Danger Variant */
.dialog-card.danger .dialog-icon-box { background: rgba(255, 63, 63, 0.1); }
.dialog-card.danger .dialog-icon-box i { color: #ff3f3f; }
.dialog-card.success .dialog-icon-box { background: rgba(0, 200, 150, 0.1); }
.dialog-card.success .dialog-icon-box i { color: #00c896; }
.dialog-card.danger .btn-primary { background: #ff3f3f; color: white; box-shadow: 0 10px 20px rgba(255, 77, 77, 0.3); }
.dialog-card.success .btn-primary { background: #00c896; color: white; box-shadow: 0 10px 20px rgba(0, 200, 150, 0.3); }
.dialog-card.danger .btn-primary:hover { background: #FF3333; box-shadow: 0 15px 30px rgba(255, 77, 77, 0.4); }
.dialog-card.success .btn-primary:hover { background: #00b385; box-shadow: 0 15px 30px rgba(0, 200, 150, 0.4); }