/* ===================================================================
   Word Unscrambler Pro - Modern Responsive Styles
   Scoped under .wup-container to avoid theme conflicts
   =================================================================== */

.wup-container {
    --wup-primary: #1D9E75;
    --wup-primary-dark: #0F6E56;
    --wup-primary-light: #5DCAA5;
    --wup-accent: #1D9E75;
    --wup-success: #10b981;
    --wup-bg: #ffffff;
    --wup-bg-soft: #f9fafb;
    --wup-bg-muted: #f3f4f6;
    --wup-border: #e5e7eb;
    --wup-border-strong: #d1d5db;
    --wup-text: #111827;
    --wup-text-soft: #4b5563;
    --wup-text-muted: #9ca3af;
    --wup-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --wup-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --wup-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --wup-radius: 14px;
    --wup-radius-sm: 8px;
    --wup-radius-lg: 20px;
    --wup-gradient: linear-gradient(135deg, #1D9E75 0%, #0F6E56 100%);

    max-width: 860px;
    margin: 24px auto;
    padding: 0 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: var(--wup-text);
    box-sizing: border-box;
}

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

/* Dark theme */
.wup-container[data-theme="dark"] {
    --wup-bg: #1f2937;
    --wup-bg-soft: #111827;
    --wup-bg-muted: #374151;
    --wup-border: #374151;
    --wup-border-strong: #4b5563;
    --wup-text: #f9fafb;
    --wup-text-soft: #d1d5db;
    --wup-text-muted: #9ca3af;
    --wup-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --wup-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --wup-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

/* Auto theme follows system preference */
@media (prefers-color-scheme: dark) {
    .wup-container[data-theme="auto"] {
        --wup-bg: #1f2937;
        --wup-bg-soft: #111827;
        --wup-bg-muted: #374151;
        --wup-border: #374151;
        --wup-border-strong: #4b5563;
        --wup-text: #f9fafb;
        --wup-text-soft: #d1d5db;
        --wup-text-muted: #9ca3af;
        --wup-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --wup-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
        --wup-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    }
}

/* Main card */
.wup-card {
    background: var(--wup-bg);
    border: 1px solid var(--wup-border);
    border-radius: var(--wup-radius-lg);
    box-shadow: var(--wup-shadow-lg);
    padding: 28px;
    position: relative;
    overflow: hidden;
}

.wup-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--wup-gradient);
}

/* Header */
.wup-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.wup-title-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
}

.wup-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--wup-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.wup-title {
    margin: 0 0 2px 0 !important;
    font-size: 22px !important;
    font-weight: 700 !important;
    color: var(--wup-text) !important;
    line-height: 1.2 !important;
}

.wup-subtitle {
    margin: 0 !important;
    font-size: 13px !important;
    color: var(--wup-text-soft) !important;
    line-height: 1.4 !important;
}

.wup-header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* Language switch */
.wup-lang-switch,
.wup-theme-switch {
    background: var(--wup-bg-muted);
    border: 1px solid var(--wup-border);
    border-radius: var(--wup-radius-sm);
    padding: 8px 12px;
    cursor: pointer;
    color: var(--wup-text);
    font-size: 13px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
    font-family: inherit;
}

.wup-lang-switch:hover,
.wup-theme-switch:hover {
    background: var(--wup-border);
    transform: translateY(-1px);
}

.wup-flag {
    font-size: 16px;
    line-height: 1;
}

.wup-theme-switch {
    padding: 8px 10px;
}

.wup-theme-switch .wup-icon-moon {
    display: none;
}

.wup-container[data-theme="dark"] .wup-theme-switch .wup-icon-sun {
    display: none;
}

.wup-container[data-theme="dark"] .wup-theme-switch .wup-icon-moon {
    display: block;
}

/* Input section */
.wup-input-section {
    margin-bottom: 16px;
}

.wup-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--wup-text-soft);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.wup-input-wrap {
    position: relative;
}

.wup-letters-input {
    width: 100%;
    padding: 16px 44px 16px 18px;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: lowercase;
    border: 2px solid var(--wup-border);
    border-radius: var(--wup-radius);
    background: var(--wup-bg-soft);
    color: var(--wup-text);
    transition: all 0.2s ease;
    font-family: "SF Mono", Monaco, Menlo, Consolas, "Liberation Mono", monospace;
    outline: none;
}

.wup-letters-input:focus {
    border-color: var(--wup-primary);
    background: var(--wup-bg);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.wup-letters-input::placeholder {
    color: var(--wup-text-muted);
    font-weight: 400;
    letter-spacing: normal;
    text-transform: none;
}

.wup-clear-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--wup-bg-muted);
    border: none;
    border-radius: 50%;
    width: 26px;
    height: 26px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--wup-text-soft);
    transition: all 0.2s ease;
    padding: 0;
}

.wup-clear-btn.visible {
    display: flex;
}

.wup-clear-btn:hover {
    background: var(--wup-border);
    color: var(--wup-text);
}

.wup-hint {
    margin: 8px 0 0 0 !important;
    font-size: 12px !important;
    color: var(--wup-text-muted) !important;
}

/* Advanced toggle */
.wup-advanced-toggle {
    margin-bottom: 12px;
}

.wup-advanced-btn {
    background: none;
    border: none;
    color: var(--wup-primary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 0;
    font-family: inherit;
}

.wup-advanced-btn:hover {
    color: var(--wup-primary-dark);
}

.wup-chevron {
    transition: transform 0.2s ease;
}

.wup-advanced-btn[aria-expanded="true"] .wup-chevron {
    transform: rotate(180deg);
}

/* Advanced panel */
.wup-advanced-panel {
    background: var(--wup-bg-soft);
    border: 1px solid var(--wup-border);
    border-radius: var(--wup-radius);
    padding: 16px;
    margin-bottom: 16px;
    animation: wup-slide-down 0.25s ease;
}

@keyframes wup-slide-down {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.wup-filter-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.wup-filter label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--wup-text-soft);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.wup-filter-input {
    width: 100%;
    padding: 8px 10px;
    font-size: 14px;
    border: 1px solid var(--wup-border);
    border-radius: var(--wup-radius-sm);
    background: var(--wup-bg);
    color: var(--wup-text);
    transition: all 0.2s ease;
    outline: none;
    font-family: inherit;
}

.wup-filter-input:focus {
    border-color: var(--wup-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Actions */
.wup-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.wup-submit-btn {
    flex: 1;
    background: var(--wup-gradient);
    color: white;
    border: none;
    border-radius: var(--wup-radius);
    padding: 14px 20px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    font-family: inherit;
}

.wup-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

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

.wup-submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.wup-reset-btn {
    background: var(--wup-bg-muted);
    color: var(--wup-text-soft);
    border: 1px solid var(--wup-border);
    border-radius: var(--wup-radius);
    padding: 14px 20px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.wup-reset-btn:hover {
    background: var(--wup-border);
    color: var(--wup-text);
}

/* Results */
.wup-results-section {
    border-top: 1px solid var(--wup-border);
    padding-top: 20px;
    margin-top: 4px;
    animation: wup-fade-in 0.3s ease;
}

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

.wup-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.wup-results-count {
    font-size: 14px;
    color: var(--wup-text-soft);
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
}

.wup-count-number {
    font-size: 22px;
    font-weight: 700;
    background: var(--wup-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.wup-results-meta {
    font-size: 12px;
    color: var(--wup-text-muted);
}

/* Word length groups */
.wup-length-group {
    margin-bottom: 20px;
}

.wup-length-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px dashed var(--wup-border);
}

.wup-length-badge {
    background: var(--wup-primary);
    color: white;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 12px;
    letter-spacing: 0.03em;
}

.wup-length-label {
    font-size: 13px;
    color: var(--wup-text-soft);
    font-weight: 600;
}

.wup-length-count {
    font-size: 12px;
    color: var(--wup-text-muted);
    margin-left: auto;
}

.wup-word-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
}

.wup-word-chip {
    background: var(--wup-bg-soft);
    border: 1px solid var(--wup-border);
    border-radius: var(--wup-radius-sm);
    padding: 10px 12px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    font-family: inherit;
    text-align: left;
    color: var(--wup-text);
    position: relative;
    overflow: hidden;
}

.wup-word-chip:hover {
    border-color: var(--wup-primary);
    transform: translateY(-1px);
    box-shadow: var(--wup-shadow-md);
}

.wup-word-chip:active {
    transform: translateY(0);
}

.wup-word-text {
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.02em;
}

.wup-word-score {
    font-size: 11px;
    font-weight: 700;
    color: var(--wup-primary);
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 6px;
    border-radius: 8px;
    flex-shrink: 0;
}

/* Loading */
.wup-loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--wup-text-soft);
}

.wup-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--wup-border);
    border-top-color: var(--wup-primary);
    border-radius: 50%;
    animation: wup-spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

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

.wup-loading p {
    margin: 0 !important;
    font-size: 14px !important;
}

/* Empty and Error states */
.wup-empty,
.wup-error {
    text-align: center;
    padding: 40px 20px;
    color: var(--wup-text-muted);
    border-top: 1px solid var(--wup-border);
    margin-top: 4px;
}

.wup-empty svg {
    margin-bottom: 12px;
    opacity: 0.5;
}

.wup-empty p,
.wup-error p {
    margin: 0 !important;
    font-size: 14px !important;
}

.wup-error {
    color: #ef4444;
}

/* Toast */
.wup-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--wup-text);
    color: var(--wup-bg);
    padding: 10px 18px;
    border-radius: var(--wup-radius);
    font-size: 13px;
    font-weight: 600;
    box-shadow: var(--wup-shadow-lg);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 99999;
    pointer-events: none;
}

.wup-toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Footer */
.wup-footer {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--wup-border);
}

.wup-info-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.wup-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--wup-bg-soft);
    border: 1px solid var(--wup-border);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 500;
    color: var(--wup-text-soft);
}

.wup-chip svg {
    color: var(--wup-success);
}

/* ===================================================================
   Responsive - Mobile
   =================================================================== */
@media (max-width: 640px) {
    .wup-container {
        padding: 0 12px;
        margin: 16px auto;
    }
    .wup-card {
        padding: 20px 16px;
        border-radius: var(--wup-radius);
    }
    .wup-header {
        flex-direction: column;
        align-items: stretch;
    }
    .wup-header-actions {
        justify-content: flex-end;
    }
    .wup-title {
        font-size: 19px !important;
    }
    .wup-subtitle {
        font-size: 12px !important;
    }
    .wup-icon {
        width: 40px;
        height: 40px;
    }
    .wup-letters-input {
        font-size: 18px;
        padding: 14px 40px 14px 14px;
    }
    .wup-filter-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .wup-actions {
        flex-direction: column;
    }
    .wup-submit-btn,
    .wup-reset-btn {
        width: 100%;
    }
    .wup-word-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 6px;
    }
    .wup-word-chip {
        padding: 8px 10px;
    }
    .wup-word-text {
        font-size: 13px;
    }
    .wup-info-chips {
        gap: 6px;
    }
}

@media (max-width: 380px) {
    .wup-filter-grid {
        grid-template-columns: 1fr;
    }
    .wup-word-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .wup-container *,
    .wup-container *::before,
    .wup-container *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}