/* -------------------------------------------------------------
   AUREUM - Old School Bodybuilding Design Variables & Style Tokens
   ------------------------------------------------------------- */
:root {
    --bg-dark: #121212;
    --bg-darker: #0b0b0b;
    --glass-bg: rgba(22, 22, 22, 0.75);
    --glass-border: rgba(212, 175, 55, 0.08); /* subtle brass tint */
    --glass-highlight: rgba(212, 175, 55, 0.12);
    
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;

    --accent-amber: #ff9f1c;
    --accent-gold: #d4af37;
    --accent-brass: #b8860b;
    --accent-steel: #8a95a5;
    --accent-green: #10b981;
    --accent-rust: #c84b31;
    
    --gradient-primary: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-amber) 100%);
    --gradient-gold: linear-gradient(135deg, #ffd700 0%, #b8860b 100%);
    --gradient-card: linear-gradient(145deg, rgba(28, 28, 28, 0.8) 0%, rgba(15, 15, 15, 0.6) 100%);

    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Syne', sans-serif;
    --font-sub: 'Outfit', sans-serif;

    --transition-smooth: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-snappy: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-premium: 0 10px 40px 0 rgba(0, 0, 0, 0.65);
    --shadow-inset: inset 0 2px 4px 0 rgba(255, 255, 255, 0.02);
}

/* -------------------------------------------------------------
   Base Layout & Reset
   ------------------------------------------------------------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-darker);
    color: var(--text-primary);
    font-family: var(--font-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Sovereign Tactical Grid & Scanline Overlays */
.tactical-grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        linear-gradient(rgba(212, 175, 55, 0.012) 1px, transparent 1px),
        linear-gradient(90deg, rgba(212, 175, 55, 0.012) 1px, transparent 1px);
    background-size: 35px 35px;
    pointer-events: none;
    z-index: 1;
}

.scanlines-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(
        rgba(18, 18, 18, 0) 50%, 
        rgba(0, 0, 0, 0.15) 50%
    );
    background-size: 100% 4px;
    pointer-events: none;
    z-index: 2;
    opacity: 0.6;
}

/* Vintage Warm BG Glows (Old School Amber) */
.ambient-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(160px);
    opacity: 0.06; /* low-key backlighting */
    pointer-events: none;
    z-index: 0;
}
.amber-glow {
    top: -10%;
    left: -10%;
    background: var(--accent-amber);
}
.brass-glow {
    bottom: -10%;
    right: -10%;
    background: var(--accent-brass);
}

/* -------------------------------------------------------------
   App Layout
   ------------------------------------------------------------- */
.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* -------------------------------------------------------------
   Sidebar Panel (Dark Steel / Raw Iron Texture)
   ------------------------------------------------------------- */
.sidebar {
    width: 280px;
    background: rgba(15, 15, 15, 0.9);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border-right: 1px solid rgba(255, 255, 255, 0.03);
    display: flex;
    flex-direction: column;
    padding: 2.5rem 1.5rem;
    position: fixed;
    height: 100vh;
    z-index: 10;
}

.brand-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
    border-bottom: 2px solid var(--accent-gold);
    padding-bottom: 1.25rem;
    width: 100%;
}

.brand-logo {
    width: 80px;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
    transition: var(--transition-smooth);
}

.brand {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--text-primary);
    text-align: center;
    width: 100%;
}

.brand-sub {
    font-family: var(--font-sub);
    font-size: 0.6rem;
    color: var(--accent-steel);
    text-transform: uppercase;
    letter-spacing: 1.2px;
    font-weight: 700;
    text-align: center;
    margin-top: -0.25rem;
    line-height: 1.3;
}

.brand-accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(212, 175, 55, 0.25);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    flex-grow: 1;
}

.nav-btn {
    background: transparent;
    border: none;
    outline: none;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.1rem 1.25rem;
    color: var(--text-secondary);
    font-family: var(--font-sub);
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-align: left;
    width: 100%;
    border: 1px solid transparent;
}

.nav-icon {
    width: 20px;
    height: 20px;
    stroke: var(--text-secondary);
    transition: var(--transition-smooth);
}

.nav-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.02);
    border-color: rgba(212, 175, 55, 0.1);
}

.nav-btn.active {
    background: var(--gradient-primary);
    color: var(--bg-darker);
    font-weight: 700;
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.25);
    border-color: var(--accent-gold);
}
.nav-btn.active .nav-icon {
    stroke: var(--bg-darker);
}

.sidebar-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding-top: 1.5rem;
}

.streak-counter {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(212, 175, 55, 0.15);
    padding: 0.85rem 1.25rem;
    border-radius: 10px;
}

.fire-icon {
    font-size: 1.5rem;
    animation: pulseFire 2s infinite ease-in-out;
}

.streak-value {
    font-family: var(--font-sub);
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--accent-gold);
}
.streak-lbl {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* -------------------------------------------------------------
   Main Content Area
   ------------------------------------------------------------- */
.main-content {
    margin-left: 280px;
    flex-grow: 1;
    padding: 2.5rem 3.5rem;
    max-width: 1400px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    gap: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    padding-bottom: 1.5rem;
}

.heading-gradient {
    font-family: var(--font-heading);
    font-size: 2.6rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 1px;
}

.text-secondary {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.25rem;
    font-family: var(--font-sub);
}

/* Toggle Switch Routine Style (Old School Iron Selector) */
.routine-toggle-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.toggle-label {
    font-family: var(--font-sub);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}
.toggle-switch {
    display: flex;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(212, 175, 55, 0.15);
    padding: 4px;
    border-radius: 8px;
}
.toggle-opt {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    font-family: var(--font-sub);
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-snappy);
}
.toggle-opt.active {
    background: var(--gradient-primary);
    color: var(--bg-darker);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.2);
}

/* -------------------------------------------------------------
   Tab Pane Architecture
   ------------------------------------------------------------- */
.tab-pane {
    display: none;
    animation: fadeInTab 0.5s ease;
}
.tab-pane.active {
    display: block;
}

/* -------------------------------------------------------------
   Hero Banner Design
   ------------------------------------------------------------- */
.hero-card {
    border-radius: 16px;
    background-size: cover;
    background-position: center;
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: 3.5rem;
    min-height: 280px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-premium);
    margin-bottom: 2.5rem;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 600px;
}

.tag {
    background: var(--gradient-primary);
    color: var(--bg-darker);
    font-weight: 800;
    font-size: 0.75rem;
    padding: 0.35rem 0.85rem;
    border-radius: 4px;
    display: inline-block;
    letter-spacing: 1.5px;
    margin-bottom: 1rem;
    font-family: var(--font-sub);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 2.3rem;
    color: white;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}
.hero-subtitle {
    font-family: var(--font-sub);
    font-size: 1.15rem;
    color: var(--accent-gold);
    margin-bottom: 2rem;
    font-weight: 500;
}

/* Progress bar inside Hero */
.progress-bar-container {
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(212, 175, 55, 0.15);
    padding: 1.25rem;
    border-radius: 10px;
    width: 100%;
}
.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-family: var(--font-sub);
}
.progress-track {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.4);
}

/* -------------------------------------------------------------
   Horizontal Days Selector Navigation
   ------------------------------------------------------------- */
.days-nav {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    margin-bottom: 2.5rem;
    scrollbar-width: none;
}
.days-nav::-webkit-scrollbar {
    display: none;
}

.day-tab-btn {
    background: var(--glass-bg);
    border: 1px solid rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    padding: 0.85rem 1.75rem;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-sub);
    font-weight: 700;
    font-size: 1rem;
    transition: var(--transition-smooth);
    white-space: nowrap;
    box-shadow: var(--shadow-inset);
}
.day-tab-btn:hover {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
    border-color: rgba(212, 175, 55, 0.15);
}
.day-tab-btn.active {
    background: rgba(212, 175, 55, 0.06);
    color: var(--accent-gold);
    border-color: var(--accent-gold);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.1);
}

/* -------------------------------------------------------------
   Exercise Feed / Layout Cards
   ------------------------------------------------------------- */
.exercise-feed {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.exercise-card {
    background: var(--gradient-card);
    border: 1px solid rgba(212, 175, 55, 0.15);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-premium), var(--shadow-inset);
}
.exercise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.8;
}
/* Premium Cast Iron Internal Bracket border */
.exercise-card::after {
    content: '';
    position: absolute;
    top: 6px;
    right: 6px;
    bottom: 6px;
    left: 6px;
    border: 1px solid rgba(212, 175, 55, 0.04);
    border-radius: 8px;
    pointer-events: none;
    transition: var(--transition-smooth);
}
.exercise-card:hover {
    border-color: var(--accent-gold);
    transform: translateY(-3px) scale(1.005);
    background: rgba(22, 22, 22, 0.95);
    box-shadow: 0 15px 35px rgba(212, 175, 55, 0.12);
}
.exercise-card:hover::after {
    border-color: rgba(212, 175, 55, 0.1);
}

/* Completed Card Styling */
.exercise-card.completed {
    background: rgba(15, 15, 15, 0.4);
    border-color: rgba(16, 185, 129, 0.15);
}
.exercise-card.completed::before {
    background: var(--accent-green);
}
.exercise-card.completed .exercise-title {
    text-decoration: line-through;
    color: var(--text-muted);
}
.exercise-card.completed .exercise-meta {
    opacity: 0.5;
}

.exercise-top-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
}

.exercise-main {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    flex-grow: 1;
}

.exercise-checkbox-wrapper {
    margin-top: 0.35rem;
}

.exercise-details {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.exercise-header-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.exercise-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    transition: var(--transition-smooth);
}

.exercise-tag {
    font-size: 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(212, 175, 55, 0.2);
    color: var(--accent-gold);
    padding: 0.3rem 0.75rem;
    border-radius: 4px;
    font-family: var(--font-sub);
    font-weight: 700;
    letter-spacing: 0.5px;
}

.exercise-instruction {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 850px;
}

.exercise-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 0.5rem;
    font-family: var(--font-sub);
    font-size: 0.85rem;
    color: var(--text-muted);
}
.meta-item {
    display: flex;
    align-items: flex-start;
    gap: 0.35rem;
    line-height: 1.4;
}

/* Beautiful Custom Checkboxes (Amber / Gold theme) */
.custom-checkbox {
    display: block;
    position: relative;
    padding-left: 35px;
    cursor: pointer;
    font-size: 1rem;
    user-select: none;
}
.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 24px;
    width: 24px;
    background-color: rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    transition: var(--transition-smooth);
}
.custom-checkbox:hover input ~ .checkmark {
    border-color: var(--accent-gold);
    background-color: rgba(212, 175, 55, 0.05);
}
.custom-checkbox input:checked ~ .checkmark {
    background-color: var(--accent-green);
    border-color: var(--accent-green);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}
.custom-checkbox input:checked ~ .checkmark:after {
    display: block;
}
.custom-checkbox .checkmark:after {
    left: 7px;
    top: 3px;
    width: 6px;
    height: 11px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Custom Action Button (Old School Raw Steel Look) */
.exercise-action {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.btn-rest {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    padding: 0.6rem 1.1rem;
    border-radius: 6px;
    font-family: var(--font-sub);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.5px;
}
.btn-rest:hover {
    color: var(--accent-gold);
    border-color: var(--accent-gold);
    background: rgba(212, 175, 55, 0.05);
}

/* -------------------------------------------------------------
   ADVANCED MOVEMENT VISUALIZER & RETRO SCHEMATICS
   ------------------------------------------------------------- */
.visualizer-toggle-btn {
    background: rgba(212, 175, 55, 0.03);
    border: 1px solid rgba(212, 175, 55, 0.15);
    color: var(--accent-gold);
}
.visualizer-toggle-btn:hover {
    color: var(--bg-darker);
    border-color: var(--accent-gold);
    background: var(--gradient-primary);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.25);
}

.exercise-visualizer-container {
    background: #0f0f0f;
    border: 1px solid rgba(212, 175, 55, 0.12);
    border-radius: 12px;
    padding: 1.5rem;
    display: none;
    flex-direction: column;
    gap: 1.5rem;
    animation: fadeInTab 0.4s ease-out;
}
.exercise-visualizer-container.expanded {
    display: flex;
}

.visualizer-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 1.5rem;
}

/* Interactive SVG Diagram Panels */
.diagram-panel {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 240px;
    overflow: hidden;
}

.diagram-panel-title {
    position: absolute;
    top: 0.75rem;
    left: 1rem;
    font-family: var(--font-sub);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ex-svg {
    width: 100%;
    max-width: 240px;
    height: 180px;
    transition: var(--transition-smooth);
}

/* -------------------------------------------------------------
   Diet Tab Architecture
   ------------------------------------------------------------- */
.diet-hero {
    background: linear-gradient(135deg, rgba(28, 28, 28, 0.9) 0%, rgba(15, 15, 15, 0.7) 100%);
    border: 1px solid rgba(212, 175, 55, 0.15);
    padding: 3rem;
    border-radius: 16px;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}
.diet-hero::after {
    content: '🥩';
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    font-size: 6rem;
    opacity: 0.1;
}
.diet-rules {
    margin-top: 1.5rem;
}
.rule-badge {
    background: rgba(200, 75, 49, 0.15);
    border: 1px solid rgba(200, 75, 49, 0.25);
    color: #f87171;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-family: var(--font-sub);
    font-weight: 700;
    font-size: 0.9rem;
    display: inline-block;
}

.diet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 1.5rem;
}

.glass-panel {
    background: var(--glass-bg);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    padding: 1.75rem;
    box-shadow: var(--shadow-premium), var(--shadow-inset);
    transition: var(--transition-smooth);
}
.glass-panel:hover {
    border-color: rgba(212, 175, 55, 0.12);
    transform: translateY(-2px);
}

.diet-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    padding-bottom: 1rem;
    margin-bottom: 1.25rem;
}
.diet-time {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    letter-spacing: 1px;
    color: white;
}
.meal-icon {
    font-size: 1.35rem;
}

.diet-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.diet-list li {
    font-family: var(--font-primary);
}
.nutr-lbl {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-sub);
    margin-left: 0.25rem;
}

/* Completed meal items */
.diet-list input:checked ~ span {
    color: var(--text-muted);
    text-decoration: line-through;
}

/* -------------------------------------------------------------
   Steps Tracker Pane
   ------------------------------------------------------------- */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.phase-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
    margin-bottom: 2.5rem;
}

.phase-card {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 1.25rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}
.phase-card:hover {
    background: rgba(255, 255, 255, 0.02);
}
.phase-card.active {
    background: rgba(212, 175, 55, 0.05);
    border-color: var(--accent-gold);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.1);
}

.phase-weeks {
    font-family: var(--font-sub);
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
}
.phase-val {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    color: white;
}
.phase-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.step-logger-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.slider-container {
    flex-grow: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
    outline: none;
}

.step-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.6);
    transition: transform 0.1s ease-in;
}
.step-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.step-count-display {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}
#stepCountVal {
    font-family: var(--font-heading);
    font-size: 3rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.steps-lbl {
    font-family: var(--font-sub);
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.step-progress-donut {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.progress-ring-circle {
    transition: stroke-dashoffset 0.35s;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
}

.donut-inner {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.donut-percentage {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    color: white;
}
.donut-sub {
    font-family: var(--font-sub);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* -------------------------------------------------------------
   Floating Rest Timer Module (Gold & Cast Iron Theme)
   ------------------------------------------------------------- */
.floating-timer-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    box-shadow: var(--shadow-premium), 0 20px 40px rgba(0,0,0,0.8);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 100;
    overflow: hidden;
}

.floating-timer-container.collapsed {
    border-radius: 50px;
    cursor: pointer;
}
.floating-timer-container.collapsed:hover {
    transform: scale(1.05);
    border-color: var(--accent-gold);
}

.timer-trigger {
    padding: 0.85rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.timer-icon {
    font-size: 1.25rem;
}
.timer-digital {
    font-family: var(--font-sub);
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--accent-gold);
    letter-spacing: 0.5px;
}

.timer-expanded-panel {
    display: none;
    width: 320px;
    padding: 1.5rem;
    flex-direction: column;
    gap: 1.25rem;
}
.floating-timer-container:not(.collapsed) .timer-trigger {
    display: none;
}
.floating-timer-container:not(.collapsed) .timer-expanded-panel {
    display: flex;
}

.timer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-heading);
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    padding-bottom: 0.75rem;
}
.timer-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-snappy);
}
.timer-close:hover {
    color: white;
}

.timer-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}
.preset-btn {
    background: rgba(255,255,255,0.01);
    border: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    padding: 0.5rem 0;
    border-radius: 4px;
    font-size: 0.85rem;
    font-family: var(--font-sub);
    cursor: pointer;
    transition: var(--transition-snappy);
}
.preset-btn:hover {
    background: rgba(255,255,255,0.04);
    color: var(--accent-gold);
    border-color: var(--accent-gold);
}

.timer-controls {
    display: flex;
    gap: 0.75rem;
}
.control-btn {
    flex: 1;
    background: var(--glass-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: white;
    padding: 0.75rem 0;
    border-radius: 6px;
    font-family: var(--font-sub);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}
#btnTimerStart {
    background: var(--gradient-primary);
    color: var(--bg-darker);
    border: none;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.25);
}
#btnTimerStart:hover {
    opacity: 0.9;
}
#btnTimerReset:hover {
    background: rgba(255, 255, 255, 0.03);
}

.timer-progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.02);
    border-radius: 2px;
    overflow: hidden;
}
.timer-progress-fill {
    width: 0%;
    height: 100%;
    background: var(--gradient-primary);
    transition: width 1s linear;
}

/* -------------------------------------------------------------
   Responsive Architecture & Micro-Animations
   ------------------------------------------------------------- */
@keyframes fadeInTab {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseFire {
    0% { transform: scale(1); filter: drop-shadow(0 0 2px rgba(212, 175, 55, 0.3)); }
    50% { transform: scale(1.08); filter: drop-shadow(0 0 10px rgba(212, 175, 55, 0.6)); }
    100% { transform: scale(1); filter: drop-shadow(0 0 2px rgba(212, 175, 55, 0.3)); }
}

@keyframes floatIcon {
    0% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
    100% { transform: translateY(0); }
}

/* Desktop viewport optimization */
@media (max-width: 1100px) {
    .sidebar {
        width: 80px;
        padding: 2.5rem 0.5rem;
        align-items: center;
    }
    .brand-container {
        border-bottom: none;
        margin-bottom: 1.5rem;
        padding-bottom: 0;
    }
    .brand-logo {
        width: 45px;
    }
    .brand {
        display: none;
    }
    .brand-sub {
        display: none;
    }
    .nav-btn span {
        display: none;
    }
    .nav-btn {
        justify-content: center;
        padding: 1rem;
    }
    .main-content {
        margin-left: 80px;
        padding: 2rem;
    }
    .streak-lbl, .streak-value {
        display: none;
    }
    .streak-counter {
        padding: 0.5rem;
        justify-content: center;
    }
}

/* Mobile viewport adjustments */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: 1rem 1.5rem;
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }
    .brand-container {
        flex-direction: row;
        width: auto;
        margin-bottom: 0;
        border-bottom: none;
        padding-bottom: 0;
        gap: 0.5rem;
        align-items: center;
    }
    .brand-logo {
        width: 38px;
    }
    .brand {
        display: block;
        font-size: 1.3rem;
        width: auto;
        text-align: left;
    }
    .brand-sub {
        display: none;
    }
    .nav-menu {
        flex-direction: row;
        gap: 0.5rem;
        flex-grow: 0;
    }
    .nav-btn {
        padding: 0.75rem;
    }
    .sidebar-footer {
        display: none;
    }
    .main-content {
        margin-left: 0;
        padding: 1.5rem;
    }
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .hero-card {
        padding: 2rem;
        min-height: auto;
    }
    .hero-title {
        font-size: 1.75rem;
    }
    .exercise-top-row {
        flex-direction: column;
        align-items: stretch;
    }
    .visualizer-grid {
        grid-template-columns: 1fr;
    }
    .diet-grid {
        grid-template-columns: 1fr;
    }
    .step-logger-section {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    .floating-timer-container {
        bottom: 1.5rem;
        right: 1.5rem;
    }
}

/* -------------------------------------------------------------
   SOVEREIGN SECURITY & LEGAL SHIELD PANEL
   ------------------------------------------------------------- */
.sovereign-watermark {
    position: fixed;
    bottom: 5%;
    right: 5%;
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    color: rgba(212, 175, 55, 0.012); /* highly subtle vintage watermark */
    pointer-events: none;
    z-index: 0;
    letter-spacing: 4px;
    text-transform: uppercase;
    user-select: none;
}

.sovereign-footer {
    margin-top: 5rem;
    background: rgba(10, 10, 10, 0.8);
    border: 1px solid rgba(212, 175, 55, 0.15);
    border-radius: 12px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
    font-family: var(--font-sub);
}
.sovereign-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(to right, var(--accent-rust), var(--accent-gold), var(--accent-rust));
}
.sovereign-shield-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}
.shield-badge {
    background: rgba(200, 75, 49, 0.15);
    border: 1px solid rgba(200, 75, 49, 0.3);
    color: #f87171;
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 800;
    border-radius: 4px;
    letter-spacing: 0.5px;
}
.shield-title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--accent-gold);
    letter-spacing: 1px;
}
.sovereign-body-text {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}
.sovereign-meta-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    padding-bottom: 1rem;
}
.sovereign-warning-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}
@media (max-width: 768px) {
    .sovereign-warning-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}
.warning-col h4 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    letter-spacing: 0.5px;
}
.warning-col p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}
.legal-email {
    margin-top: 0.75rem;
    font-weight: 700;
    color: var(--accent-gold);
    font-size: 0.9rem;
}
.alert-col {
    background: rgba(200, 75, 49, 0.03);
    border: 1px solid rgba(200, 75, 49, 0.1);
    padding: 1.25rem;
    border-radius: 8px;
}
.statute-tag {
    color: #f87171;
    font-weight: 700;
    font-size: 0.75rem;
    display: block;
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
}
.sovereign-copyright {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    padding-top: 1.25rem;
}