/* ==========================================================================
   FitWithPhu - Main Stylesheet (Vanilla CSS)
   ========================================================================== */

/* Design Tokens & CSS Variables */
:root {
    /* Color Palette */
    --color-bg-deep: #020617;       /* Deep slate black */
    --color-bg-main: #0b1329;       /* Slate navy main */
    --color-glass-bg: rgba(15, 23, 42, 0.55);
    --color-glass-border: rgba(255, 255, 255, 0.07);
    
    --color-primary: #84cc16;       /* Neon Lime */
    --color-primary-glow: rgba(132, 204, 22, 0.3);
    --color-secondary: #06b6d4;     /* Electric Teal/Cyan */
    --color-secondary-glow: rgba(6, 182, 212, 0.25);
    
    --color-text-bright: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    
    /* BMI Status Colors */
    --color-bmi-under: #38bdf8;     /* Light blue */
    --color-bmi-normal: #4ade80;    /* Green */
    --color-bmi-over: #fb923c;      /* Orange */
    --color-bmi-obese: #f87171;     /* Red */

    /* Typography */
    --font-thai: 'Prompt', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-eng: 'Outfit', sans-serif;

    /* Transitions & Shadows */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-glow-green: 0 0 20px rgba(132, 204, 22, 0.25);
    --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.2);
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

/* Reset & Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-thai);
    background-color: var(--color-bg-deep);
    color: var(--color-text-bright);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: absolute;
    top: 20%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-secondary-glow) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

body::after {
    content: '';
    position: absolute;
    bottom: 15%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

ul {
    list-style: none;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--color-bg-deep);
}
::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: #334155;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-center {
    text-align: center;
}

.hidden {
    display: none !important;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-thai);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 12px 28px;
    border-radius: 12px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background-color: var(--color-primary);
    color: #000;
    font-weight: 600;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-green);
    background-color: #9ef01a;
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: #fff;
    font-weight: 500;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-cyan);
    background-color: #22d3ee;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--color-text-dim);
    color: var(--color-text-bright);
}

.btn-outline:hover {
    border-color: var(--color-text-bright);
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-large {
    width: 65px;
    height: 65px;
    font-size: 1.4rem;
}

.btn-neutral {
    background-color: #1e293b;
    border-color: rgba(255, 255, 255, 0.05);
    color: var(--color-text-bright);
}

.btn-neutral:hover {
    background-color: #334155;
    border-color: rgba(255, 255, 255, 0.15);
}

/* Header & Nav Styling */
#main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    display: flex;
    align-items: center;
    background-color: rgba(2, 6, 23, 0.7);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--color-glass-border);
    z-index: 100;
    transition: all var(--transition-fast);
}

#main-header.scrolled {
    height: 65px;
    background-color: rgba(2, 6, 23, 0.9);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.6rem;
    color: var(--color-primary);
    filter: drop-shadow(0 0 5px var(--color-primary-glow));
}

.logo-text {
    font-family: var(--font-thai);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text-bright);
}

.logo-text span {
    color: var(--color-secondary);
}

#nav-menu ul {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-muted);
    padding: 6px 0;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-bright);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    font-size: 1.4rem;
    color: var(--color-text-bright);
    cursor: pointer;
}

/* Sections Global Headers */
.section-header {
    margin-bottom: 50px;
}

.section-tagline {
    font-family: var(--font-eng);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    display: inline-block;
    margin-bottom: 10px;
}

.section-title {
    font-size: 2.2rem;
    color: var(--color-text-bright);
    margin-bottom: 15px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 650px;
    margin: 0 auto;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    padding-top: 80px; /* Header space */
    display: flex;
    align-items: center;
    background: url('assets/hero_bg.png') no-repeat center center/cover;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(2, 6, 23, 0.95) 40%, rgba(11, 19, 41, 0.7) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding-top: 40px;
    padding-bottom: 80px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(132, 204, 22, 0.1);
    border: 1px solid rgba(132, 204, 22, 0.2);
    color: var(--color-primary);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(132, 204, 22, 0.4); }
    70% { transform: scale(1.02); box-shadow: 0 0 0 10px rgba(132, 204, 22, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(132, 204, 22, 0); }
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.25;
    margin-bottom: 24px;
}

.hero-title .highlight {
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

.hero-scroll-indicator a {
    font-size: 1.8rem;
    color: var(--color-text-muted);
}

.hero-scroll-indicator a:hover {
    color: var(--color-primary);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-10px) translateX(-50%); }
    60% { transform: translateY(-5px) translateX(-50%); }
}

/* BMI Section */
.bmi-calc {
    padding: 100px 0;
    background-color: var(--color-bg-main);
    border-bottom: 1px solid var(--color-glass-border);
}

.bmi-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-top: 40px;
}

.bmi-card {
    background-color: var(--color-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-glass-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

.bmi-card h3 {
    font-size: 1.5rem;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text-bright);
}

.bmi-card h3 i {
    color: var(--color-primary);
}

/* BMI Form Controls */
.form-group {
    margin-bottom: 24px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 16px;
    color: var(--color-text-dim);
    font-size: 1.1rem;
    transition: var(--transition-fast);
}

.input-wrapper input {
    width: 100%;
    padding: 14px 60px 14px 48px;
    background-color: rgba(2, 6, 23, 0.4);
    border: 1px solid var(--color-glass-border);
    border-radius: 12px;
    color: var(--color-text-bright);
    font-family: var(--font-eng);
    font-size: 1.1rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

/* Remove number spinner buttons */
.input-wrapper input::-webkit-outer-spin-button,
.input-wrapper input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(132, 204, 22, 0.15);
    background-color: rgba(2, 6, 23, 0.6);
}

.input-wrapper input:focus ~ .input-icon {
    color: var(--color-primary);
}

.input-unit {
    position: absolute;
    right: 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-dim);
}

.error-msg {
    display: block;
    color: #f87171;
    font-size: 0.8rem;
    margin-top: 6px;
    display: none; /* Shown dynamically */
}

/* BMI Results Display */
.bmi-result-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 400px;
}

.result-placeholder {
    text-align: center;
    padding: 20px;
}

.placeholder-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--color-text-dim);
}

.placeholder-icon {
    font-size: 2.2rem;
}

.result-placeholder h4 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.result-placeholder p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Gauge Chart Design */
.result-display {
    animation: fadeIn var(--transition-normal);
}

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

.result-display h3 {
    text-align: center;
    margin-bottom: 16px;
}

.gauge-container {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

.gauge {
    position: relative;
    width: 220px;
    height: 110px;
    overflow: hidden;
}

.gauge-body {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 200%;
    border-radius: 50%;
    background: conic-gradient(
        from 270deg,
        var(--color-bmi-under) 0%,      /* Underweight */
        var(--color-bmi-under) 45deg,
        var(--color-bmi-normal) 45deg,   /* Normal */
        var(--color-bmi-normal) 99deg,
        var(--color-bmi-over) 99deg,     /* Overweight */
        var(--color-bmi-over) 135deg,
        var(--color-bmi-obese) 135deg,   /* Obese */
        var(--color-bmi-obese) 180deg,
        transparent 180deg,
        transparent 360deg
    );
}

.gauge-fill {
    position: absolute;
    top: 10px;
    left: calc(50% - 2px);
    width: 4px;
    height: 100px;
    background-color: var(--color-text-bright);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.8);
    border-radius: 4px 4px 0 0;
    transform-origin: center bottom;
    transform: rotate(-90deg); /* 0 to 180 deg (mapped from -90 to 90 deg), set dynamically in JS */
    transition: transform 1.5s cubic-bezier(0.19, 1, 0.22, 1);
    z-index: 2;
}


.gauge-cover {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 0;
    background-color: #0c152b; /* Match body card background */
    border-radius: 50% 50% 0 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    padding-bottom: 10px;
    border: 1px solid var(--color-glass-border);
    border-bottom: none;
}

.bmi-value {
    font-family: var(--font-eng);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-text-bright);
    line-height: 1;
}

.bmi-label {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 4px;
}

.bmi-status {
    text-align: center;
    padding: 6px 18px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.05rem;
    display: inline-block;
    margin: 0 auto 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.bmi-status.under { background-color: var(--color-bmi-under); color: #000; }
.bmi-status.normal { background-color: var(--color-bmi-normal); color: #000; }
.bmi-status.over { background-color: var(--color-bmi-over); color: #000; }
.bmi-status.obese { background-color: var(--color-bmi-obese); color: #fff; }

.bmi-explanation {
    background-color: rgba(2, 6, 23, 0.3);
    border-radius: 12px;
    padding: 16px;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: 24px;
    border: 1px solid rgba(255, 255, 255, 0.02);
}

.recommendation-box {
    background-color: rgba(255, 255, 255, 0.02);
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 28px;
    border: 1px solid var(--color-glass-border);
}

.recommendation-box h5 {
    font-size: 0.95rem;
    color: var(--color-text-bright);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.recommendation-box h5:nth-of-type(2) {
    margin-top: 14px;
}

.recommendation-box h5 i {
    color: var(--color-secondary);
}

.recommendation-box p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.action-btn-group {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* Workout Library Section */
.workouts {
    padding: 100px 0;
    background-color: var(--color-bg-deep);
}

.workout-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 30px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-thai);
    font-size: 0.9rem;
    font-weight: 500;
    background-color: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    color: var(--color-text-muted);
    padding: 10px 20px;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.filter-btn:hover {
    color: var(--color-text-bright);
    background-color: rgba(255, 255, 255, 0.05);
}

.filter-btn.active {
    background-color: var(--color-primary);
    color: #000;
    border-color: var(--color-primary);
    font-weight: 600;
    box-shadow: var(--shadow-glow-green);
}

.workout-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
}

/* Workout Card Design */
.workout-card {
    background-color: var(--color-glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--color-glass-border);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.workout-card:hover {
    transform: translateY(-8px);
    border-color: rgba(132, 204, 22, 0.2);
    box-shadow: 0 15px 35px -10px rgba(0,0,0,0.6);
}

.workout-img-wrapper {
    position: relative;
    height: 180px;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-dim);
}

.workout-img-wrapper i {
    font-size: 4rem;
    transition: var(--transition-normal);
}

.workout-card:hover .workout-img-wrapper i {
    transform: scale(1.15) rotate(5deg);
    color: var(--color-secondary);
}

/* Card badges */
.workout-badges {
    position: absolute;
    top: 16px;
    left: 16px;
    right: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge-tag {
    font-family: var(--font-eng);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 50px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.badge-tag.cardio { background-color: rgba(6, 182, 212, 0.15); color: var(--color-secondary); border: 1px solid rgba(6, 182, 212, 0.2); }
.badge-tag.strength { background-color: rgba(132, 204, 22, 0.1); color: var(--color-primary); border: 1px solid rgba(132, 204, 22, 0.2); }
.badge-tag.yoga { background-color: rgba(168, 85, 247, 0.15); color: #c084fc; border: 1px solid rgba(168, 85, 247, 0.2); }

.badge-duration {
    font-size: 0.8rem;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    color: var(--color-text-bright);
    padding: 4px 10px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.workout-card-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.workout-card-title {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--color-text-bright);
}

.workout-card-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    flex-grow: 1;
}

.workout-card-instructions {
    margin-bottom: 24px;
    padding-left: 20px;
}

.workout-card-instructions li {
    font-size: 0.85rem;
    color: var(--color-text-dim);
    margin-bottom: 6px;
    position: relative;
    list-style-type: disc;
}

.workout-card-instructions li::marker {
    color: var(--color-secondary);
}

.workout-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--color-glass-border);
    padding-top: 16px;
}

.workout-difficulty {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.workout-difficulty span {
    font-weight: 600;
    color: var(--color-primary);
}

/* Health Tips Section */
.health-tips {
    padding: 100px 0;
    background-color: var(--color-bg-main);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.tip-card {
    background-color: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.tip-card:hover {
    transform: translateY(-5px);
    border-color: rgba(6, 182, 212, 0.2);
}

.tip-image-placeholder {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
}

.tip-1-bg { background: linear-gradient(135deg, #1e1b4b 0%, #311042 100%); color: #e9d5ff; }
.tip-2-bg { background: linear-gradient(135deg, #0c4a6e 0%, #164e63 100%); color: #cffafe; }
.tip-3-bg { background: linear-gradient(135deg, #14532d 0%, #064e3b 100%); color: #dcfce7; }

.tip-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.tip-meta {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    margin-bottom: 8px;
}

.tip-title {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--color-text-bright);
    line-height: 1.4;
}

.tip-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    flex-grow: 1;
}

.tip-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-secondary);
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.tip-link i {
    transition: transform var(--transition-fast);
}

.tip-card:hover .tip-link i {
    transform: translateX(5px);
}

/* Footer Section */
#main-footer {
    background-color: #020617;
    border-top: 1px solid var(--color-glass-border);
    padding: 80px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 16px;
    margin-bottom: 24px;
    max-width: 320px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: #000;
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-green);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.1rem;
    margin-bottom: 24px;
    color: var(--color-text-bright);
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links ul li a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-links ul li a:hover {
    color: var(--color-primary);
    padding-left: 5px;
}

.footer-contact p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact p i {
    color: var(--color-secondary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

/* Modal Styling - Interactive Workout Timer */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background-color: rgba(2, 6, 23, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.modal-backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    background-color: #0b1329;
    border: 1px solid var(--color-glass-border);
    width: 90%;
    max-width: 480px;
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.8), var(--shadow-glow-cyan);
    position: relative;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-backdrop.open .modal-card {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 24px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 2rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--color-text-bright);
}

.modal-tag {
    font-family: var(--font-eng);
    font-size: 0.75rem;
    font-weight: 700;
    background-color: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    color: var(--color-secondary);
    padding: 4px 12px;
    border-radius: 50px;
    letter-spacing: 0.1em;
    display: inline-block;
    margin-bottom: 12px;
}

.modal-title {
    font-size: 1.6rem;
    margin-bottom: 6px;
}

.modal-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 30px;
}

/* Circular Progress Timer */
.timer-visual-container {
    position: relative;
    width: 180px;
    height: 180px;
    margin: 0 auto 30px;
}

.timer-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg); /* Start progress from top center */
}

.timer-track {
    fill: none;
    stroke: rgba(255, 255, 255, 0.03);
    stroke-width: 8px;
}

.timer-progress {
    fill: none;
    stroke: var(--color-secondary);
    stroke-width: 8px;
    stroke-linecap: round;
    /* Circumference = 2 * PI * R = 2 * 3.14159 * 70 = 439.82 => ~440 */
    stroke-dasharray: 440;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.1s linear, stroke var(--transition-normal);
}

.timer-time {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-eng);
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--color-text-bright);
}

.timer-status-text {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.timer-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.8rem;
    }
    
    .bmi-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    
    .footer-brand p {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    /* Sticky Navigation on Mobile */
    .mobile-toggle {
        display: block;
    }
    
    #nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: rgba(2, 6, 23, 0.95);
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        border-bottom: 1px solid var(--color-glass-border);
        padding: 30px;
        transform: translateY(-150%);
        transition: transform var(--transition-normal);
        z-index: 99;
    }
    
    #nav-menu.open {
        transform: translateY(0);
    }
    
    #nav-menu ul {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
}