* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-400: #9ca3af;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #1f2937;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    padding: 16px;
    font-size: 16px; /* Verhindert Zoom auf iOS */
    -webkit-font-smoothing: antialiased;
}

/* ===================================
   CONFIG SECTION
   =================================== */
.config-section {
    max-width: 480px;
    margin: 40px auto;
}

.config-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

.config-header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 32px 24px;
    text-align: center;
}

.config-header h1 {
    font-size: 24px;
    margin-bottom: 8px;
    font-weight: 700;
}

.subtitle {
    opacity: 0.9;
    font-size: 14px;
    font-weight: 400;
}

.config-body {
    padding: 24px;
}

/* ===================================
   MAIN APP
   =================================== */
#main-app {
    max-width: 680px;
    margin: 0 auto;
}

/* ===================================
   PROGRESS SECTION
   =================================== */
.progress-section {
    background: white;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.progress-phases {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 16px;
}

.phase {
    flex: 1;
    text-align: center;
}

.phase-label {
    display: block;
    font-size: 10px;
    font-weight: 700;
    color: var(--gray-400);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.phase.active .phase-label {
    color: var(--primary);
}

.phase-dots {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--gray-200);
    transition: all 0.3s ease;
}

.dot.completed {
    background: var(--primary);
    transform: scale(1.1);
}

.dot.active {
    background: var(--primary);
    transform: scale(1.3);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

.step-counter {
    text-align: center;
    font-size: 13px;
    color: var(--gray-600);
    font-weight: 600;
}

/* ===================================
   SUMMARY CARD (STICKY)
   =================================== */
.summary-card {
    background: white;
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.summary-header {
    background: var(--gray-50);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-700);
}

.summary-header:active {
    background: var(--gray-100);
}

.toggle-icon {
    transition: transform 0.3s ease;
    font-size: 12px;
}

.summary-card.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.summary-body {
    padding: 16px;
    border-top: 1px solid var(--gray-200);
}

.summary-item {
    padding: 8px 0;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.summary-item .check {
    color: var(--success);
    font-weight: 700;
}

.summary-item .label {
    color: var(--gray-600);
}

.summary-item .value {
    color: var(--gray-900);
    font-weight: 600;
    margin-left: auto;
}

/* ===================================
   CONTENT AREA
   =================================== */
.app-content {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    min-height: 400px;
}

.step-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.step-subtitle {
    font-size: 14px;
    color: var(--gray-600);
    margin-bottom: 24px;
    line-height: 1.5;
}

/* ===================================
   FORM ELEMENTS
   =================================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-700);
    font-size: 14px;
}

.form-group select,
.form-group input[type="number"],
.form-group input[type="text"] {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s;
    font-family: inherit;
    background: white;
    -webkit-appearance: none;
    min-height: 56px; /* Touch-friendly */
}

.form-group input[type="number"] {
    text-align: center;
    letter-spacing: 1px;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-group input.valid {
    border-color: var(--success);
    background: #f0fdf4;
}

.form-group input.invalid {
    border-color: var(--error);
    background: #fef2f2;
}

/* Verhindert Zoom bei Fokus auf iOS */
@supports (-webkit-touch-callout: none) {
    input, select, textarea {
        font-size: 16px !important;
    }
}

/* ===================================
   QUICK SELECT BUTTONS
   =================================== */
.quick-select {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.quick-btn {
    flex: 1;
    min-width: 60px;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    background: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.quick-btn:hover {
    border-color: var(--primary);
    background: #f8f9ff;
}

.quick-btn.selected {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
}

.quick-btn:active {
    transform: scale(0.95);
}

/* ===================================
   INFO BOXES
   =================================== */
.info-box {
    padding: 12px 16px;
    border-radius: 10px;
    margin: 16px 0;
    font-size: 14px;
    line-height: 1.6;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.info-box.info {
    background: #eff6ff;
    border-left: 4px solid var(--info);
    color: #1e3a8a;
}

.info-box.success {
    background: #f0fdf4;
    border-left: 4px solid var(--success);
    color: #065f46;
}

.info-box.warning {
    background: #fffbeb;
    border-left: 4px solid var(--warning);
    color: #92400e;
}

.info-box.error {
    background: #fef2f2;
    border-left: 4px solid var(--error);
    color: #991b1b;
}

.info-box .icon {
    font-size: 18px;
    flex-shrink: 0;
}

/* ===================================
   HELP TOGGLE
   =================================== */
.help-toggle {
    background: none;
    border: none;
    color: var(--info);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
}

.help-toggle:hover {
    text-decoration: underline;
}

.help-content {
    background: #eff6ff;
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 16px;
    display: none;
    animation: slideDown 0.3s ease;
}

.help-content.show {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.help-content h4 {
    font-size: 14px;
    margin-bottom: 8px;
    color: var(--info);
}

.help-content p {
    font-size: 13px;
    line-height: 1.6;
    color: #1e3a8a;
}

/* ===================================
   TOLERANCE DISPLAY
   =================================== */
.tolerance-box {
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    padding: 16px;
    margin: 16px 0;
}

.tolerance-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--gray-200);
    font-size: 14px;
}

.tolerance-row:last-child {
    border-bottom: none;
}

.tolerance-label {
    color: var(--gray-600);
    font-weight: 500;
}

.tolerance-value {
    font-weight: 700;
    color: var(--gray-900);
    font-size: 16px;
}

/* Visual Range Indicator */
.range-indicator {
    margin: 16px 0;
    padding: 16px;
    background: white;
    border-radius: 10px;
    border: 2px solid var(--gray-200);
}

.range-bar {
    position: relative;
    height: 40px;
    background: var(--gray-100);
    border-radius: 20px;
    margin: 12px 0;
}

.range-fill {
    position: absolute;
    height: 100%;
    background: linear-gradient(90deg, var(--success) 0%, var(--primary) 100%);
    border-radius: 20px;
    transition: width 0.3s ease;
}

.range-marker {
    position: absolute;
    top: -8px;
    transform: translateX(-50%);
    width: 4px;
    height: 56px;
    background: var(--gray-400);
    border-radius: 2px;
}

.range-marker.current {
    background: var(--error);
    width: 6px;
    z-index: 10;
}

.range-marker::after {
    content: attr(data-label);
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
    color: var(--gray-600);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 12px;
    color: var(--gray-600);
}

/* ===================================
   LIVE VALIDATION FEEDBACK
   =================================== */
.validation-feedback {
    margin-top: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    display: none;
}

.validation-feedback.valid {
    background: #f0fdf4;
    color: var(--success);
    display: block;
}

.validation-feedback.invalid {
    background: #fef2f2;
    color: var(--error);
    display: block;
}

/* ===================================
   BUTTONS
   =================================== */
.button-group {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

.btn {
    flex: 1;
    padding: 16px 24px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    min-height: 56px; /* Touch-friendly */
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

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

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-secondary:active {
    transform: scale(0.98);
}

.btn-large {
    width: 100%;
    font-size: 18px;
    padding: 20px;
    min-height: 64px;
}

/* ===================================
   RADIO GROUP
   =================================== */
.radio-group {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.radio-item {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 16px;
    font-weight: 600;
    min-height: 56px;
    background: white;
}

.radio-item input {
    display: none;
}

.radio-item:hover {
    border-color: var(--primary);
    background: #f8f9ff;
}

.radio-item.selected {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--primary);
}

.radio-item:active {
    transform: scale(0.97);
}

/* ===================================
   PORE HINT
   =================================== */
.pore-hint {
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
    border: 3px solid var(--info);
    border-radius: 16px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
}

.pore-hint-title {
    font-size: 14px;
    font-weight: 600;
    color: #1e40af;
    margin-bottom: 12px;
}

.pore-hint-value {
    font-size: 36px;
    font-weight: 900;
    color: #1e3a8a;
    margin: 12px 0;
    letter-spacing: 1px;
}

.pore-hint-calc {
    font-size: 12px;
    color: #60a5fa;
    margin-top: 8px;
}

/* ===================================
   RESULT CARD
   =================================== */
.result-card {
    border-radius: 16px;
    padding: 32px 24px;
    margin-bottom: 16px;
    border: 4px solid;
}

.result-card.success {
    border-color: var(--success);
    background: linear-gradient(to bottom, #f0fdf4, white);
}

.result-card.error {
    border-color: var(--error);
    background: linear-gradient(to bottom, #fef2f2, white);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
}

.result-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.result-icon.success {
    background: var(--success);
}

.result-icon.error {
    background: var(--error);
}

.result-title {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.result-title.success {
    color: #065f46;
}

.result-title.error {
    color: #991b1b;
}

.result-reason {
    font-size: 15px;
    margin-top: 6px;
    color: var(--gray-600);
    font-weight: 500;
}

.result-details {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-top: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.result-detail-item {
    padding: 12px;
    margin-bottom: 8px;
    background: var(--gray-50);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.result-detail-item.fail {
    background: #fee2e2;
    border-left: 4px solid var(--error);
}

.result-detail-item strong {
    font-weight: 700;
}

/* ===================================
   LOADING
   =================================== */
.loading {
    text-align: center;
    padding: 48px 24px;
}

.spinner {
    border: 4px solid var(--gray-100);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    color: var(--gray-600);
    font-size: 16px;
    font-weight: 600;
}

/* ===================================
   TOASTS
   =================================== */
.error-toast,
.success-toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 16px 24px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    animation: slideInDown 0.3s ease;
    max-width: 90%;
}

.error-toast {
    background: var(--error);
    color: white;
}

.success-toast {
    background: var(--success);
    color: white;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translate(-50%, -20px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 480px) {
    body {
        padding: 12px;
    }
    
    .app-content {
        padding: 20px 16px;
    }
    
    .step-title {
        font-size: 18px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .quick-select {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .progress-phases {
        flex-direction: column;
        gap: 12px;
    }
    
    .phase-label {
        font-size: 9px;
    }
}

/* ===================================
   DARK MODE (Optional)
   =================================== */
@media (prefers-color-scheme: dark) {
    /* Optional: Dark Mode Support */
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
    body {
        background: white;
    }
    
    .progress-section,
    .button-group,
    .summary-card {
        display: none;
    }
}