@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-main: #090d16;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(26, 36, 56, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(59, 130, 246, 0.4);
    
    /* BMW M-Sport Inspired Accent Colors */
    --accent-blue: #1d4ed8;
    --accent-blue-light: #3b82f6;
    --accent-red: #e11d48;
    --accent-silver: #cbd5e1;
    --accent-yellow: #eab308;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-neon: 0 0 15px rgba(59, 130, 246, 0.25);
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding: 2rem 1rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow-x: hidden;
    position: relative;
}

/* Background decorative lights */
body::before, body::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.15;
}

body::before {
    background-color: var(--accent-blue-light);
    top: 10%;
    left: 5%;
}

body::after {
    background-color: var(--accent-red);
    bottom: 20%;
    right: 5%;
}

/* Main Container */
.app-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header & Banner */
.hero-header {
    background: linear-gradient(135deg, rgba(22, 28, 45, 0.8) 0%, rgba(10, 15, 30, 0.95) 100%);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* Accent top border strip (BMW M style) */
.m-strip {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    display: flex;
}
.m-strip .blue-light { background-color: #2563eb; flex: 1; }
.m-strip .blue-dark { background-color: #1e3a8a; flex: 1; }
.m-strip .red { background-color: #dc2626; flex: 1; }

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.brand-title {
    display: flex;
    flex-direction: column;
}

.brand-subtitle {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-blue-light);
}

.main-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #f8fafc, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-top: 0.2rem;
}

.spec-badge {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--accent-blue-light);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.1);
}

.spec-badge svg {
    width: 16px;
    height: 16px;
}

/* Quick specs ribbon */
.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.spec-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.spec-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.spec-value {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: baseline;
    gap: 0.2rem;
}

.spec-unit {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Expandable Tools Section */
.tools-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-normal);
}

.tools-trigger {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}

.tools-trigger:hover {
    background: rgba(255, 255, 255, 0.02);
}

.tools-title-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tools-title-group svg {
    color: var(--accent-blue-light);
    width: 20px;
    height: 20px;
}

.chevron-icon {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: transform var(--transition-normal);
}

.tools-panel.open .chevron-icon {
    transform: rotate(180deg);
}

.tools-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) ease-out, padding var(--transition-normal);
}

.tools-panel.open .tools-content {
    max-height: 1000px;
    padding: 0 1.5rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-top: 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding-top: 1.25rem;
}

@media (max-width: 600px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
}

.tools-column h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-blue-light);
    margin-bottom: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tools-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tools-column li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.bullet-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--border-hover);
    flex-shrink: 0;
}

/* Progress Tracker */
.progress-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.progress-pct {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--accent-blue-light);
}

.progress-bar-bg {
    width: 100%;
    height: 8px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 9999px;
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.02);
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
    border-radius: 9999px;
    transition: width var(--transition-slow);
    box-shadow: var(--shadow-neon);
}

/* Checklist Sections & Steps */
.checklist-section {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.phase-block {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.phase-block:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.phase-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-bottom: 0.25rem;
}

.phase-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 800;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    letter-spacing: 0.5px;
}

.phase-badge.prep { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue-light); border: 1px solid rgba(59, 130, 246, 0.2); }
.phase-badge.drain { background: rgba(239, 68, 68, 0.15); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.2); }
.phase-badge.filter { background: rgba(168, 85, 247, 0.15); color: #c084fc; border: 1px solid rgba(168, 85, 247, 0.2); }
.phase-badge.fill { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.2); }
.phase-badge.verify { background: rgba(234, 179, 8, 0.15); color: #facc15; border: 1px solid rgba(234, 179, 8, 0.2); }

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Individual Checklist Item */
.step-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    user-select: none;
    transition: var(--transition-normal);
}

.step-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.05);
}

/* Input checkbox wrapper */
.checkbox-wrapper {
    position: relative;
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    margin-top: 0.15rem;
}

.checkbox-wrapper input[type="checkbox"] {
    opacity: 0;
    width: 100%;
    height: 100%;
    position: absolute;
    cursor: pointer;
    z-index: 2;
}

.custom-checkbox {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 2px solid var(--text-muted);
    border-radius: 6px;
    background-color: transparent;
    transition: var(--transition-fast);
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkbox-wrapper input[type="checkbox"]:checked ~ .custom-checkbox {
    background-color: var(--accent-blue-light);
    border-color: var(--accent-blue-light);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.4);
}

/* Checkmark SVG path style */
.custom-checkbox svg {
    width: 12px;
    height: 12px;
    color: var(--text-primary);
    stroke-dasharray: 20;
    stroke-dashoffset: 20;
    transition: stroke-dashoffset 0.25s ease-out;
}

.checkbox-wrapper input[type="checkbox"]:checked ~ .custom-checkbox svg {
    stroke-dashoffset: 0;
}

/* Text and details formatting */
.step-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex-grow: 1;
}

.step-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.step-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.torque-tag {
    display: inline-flex;
    align-items: center;
    background: rgba(234, 179, 8, 0.12);
    border: 1px solid rgba(234, 179, 8, 0.2);
    color: var(--accent-yellow);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    white-space: nowrap;
}

/* Checked styling */
.step-item.checked {
    background: rgba(255, 255, 255, 0.005);
    border-color: rgba(255, 255, 255, 0.04);
}

.step-item.checked:hover {
    transform: none;
    box-shadow: none;
}

.step-item.checked .step-title {
    color: var(--text-muted);
    text-decoration: line-through;
    text-decoration-color: var(--text-muted);
}

.step-item.checked .step-description {
    color: var(--text-muted);
}

.step-item.checked .torque-tag {
    background: rgba(255, 255, 255, 0.02);
    border-color: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

/* Action Controls (Reset/Complete) */
.action-panel {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.btn-complete {
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    padding: 1rem 2rem;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.btn-complete:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-neon), 0 8px 24px rgba(59, 130, 246, 0.2);
    filter: brightness(1.1);
}

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

.btn-complete svg {
    width: 20px;
    height: 20px;
}

/* Custom Alert / Confirmation Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(6, 9, 17, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-box {
    background: linear-gradient(135deg, rgba(22, 28, 45, 0.95) 0%, rgba(10, 15, 30, 0.98) 100%);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    width: 90%;
    max-width: 440px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), var(--shadow-neon);
    transform: scale(0.9) translateY(10px);
    transition: transform var(--transition-normal);
    text-align: center;
}

.modal-overlay.active .modal-box {
    transform: scale(1) translateY(0);
}

.modal-icon {
    width: 56px;
    height: 56px;
    background: rgba(225, 29, 72, 0.1);
    border: 1px solid rgba(225, 29, 72, 0.2);
    color: var(--accent-red);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem auto;
}

.modal-icon svg {
    width: 28px;
    height: 28px;
}

.modal-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.modal-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
    line-height: 1.45;
}

.modal-buttons {
    display: flex;
    gap: 1rem;
}

.btn-modal {
    flex: 1;
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-modal-cancel {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-modal-cancel:hover {
    background: rgba(255, 255, 255, 0.08);
}

.btn-modal-confirm {
    background: var(--accent-red);
    border: 1px solid rgba(225, 29, 72, 0.2);
    color: var(--text-primary);
}

.btn-modal-confirm:hover {
    background: #f43f5e;
    box-shadow: 0 0 12px rgba(225, 29, 72, 0.3);
}

/* Custom Scrollbar for modern feel */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Orientation Reference Card Styling */
.orientation-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-normal);
}

.orientation-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.orientation-title {
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-blue-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.orientation-title svg {
    width: 18px;
    height: 18px;
}

.orientation-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    line-height: 1.4;
}

.orientation-graphic-wrapper {
    width: 100%;
    max-width: 500px;
    background: rgba(6, 9, 17, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 1rem;
    margin: 0.5rem 0;
}

.orientation-svg {
    width: 100%;
    height: auto;
    display: block;
}

/* Credit Footer Styling */
.app-credit {
    text-align: center;
    margin-top: 1rem;
    margin-bottom: 1.5rem;
}

.app-credit p {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.5px;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.app-credit p:hover {
    opacity: 1;
    color: var(--accent-blue-light);
}