@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@700&family=Nunito+Sans:wght@500;700;800&display=swap');

:root {
  /* Colors */
  --color-duo-green: #58cc02;
  --color-sky-blue: #1cb0f6;
  --color-duo-green-light: #d7ffb8;
  --color-sunshine-yellow: #ffc700;
  --color-grape-soda: #a570ff;
  --color-bubblegum-pink: #cc348d;
  --color-snow-white: #ffffff;
  --color-cloud-gray: #e5e5e5;
  --color-silver: #afafaf;
  --color-graphite: #777777;
  --color-charcoal: #4b4b4b;
  --color-almost-black: #3c3c3c;

  /* Typography — Font Families */
  --font-feather: 'Baloo 2', ui-sans-serif, system-ui, sans-serif;
  --font-din-round: 'Nunito Sans', ui-sans-serif, system-ui, sans-serif;

  /* Typography — Fluid Scale (Mobile First) */
  --text-caption: 13px;
  --text-body: 15px;
  --text-heading-sm: clamp(17px, 4vw, 19px);
  --text-heading: clamp(24px, 5vw, 32px);
  --text-heading-lg: clamp(32px, 6vw, 48px);
  --text-display: clamp(40px, 8vw, 64px);

  --leading-body: 1.4;
  --leading-heading: 1.2;

  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  /* Legacy Variables */
  --bg-main: var(--color-snow-white);
  --bg-card: var(--color-snow-white);
  --text-primary: var(--color-almost-black);
  --text-secondary: var(--color-charcoal);
  --text-muted: var(--color-silver);
  
  --primary-color: var(--color-duo-green);
  --primary-hover: #46a302;
  --primary-light: var(--color-duo-green-light);
  
  --header-bg: var(--color-snow-white);
  --header-text: var(--color-almost-black);
  
  --border-color: var(--color-cloud-gray);
  
  --radius-md: 12px;
  --radius-lg: 12px;
  --transition: all 0.1s ease;
  
  /* Fluid Spacing */
  --spacing-unit: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-24: clamp(16px, 4vw, 24px);
  --spacing-32: clamp(24px, 5vw, 32px);
  --spacing-40: clamp(32px, 6vw, 40px);
  --spacing-48: clamp(32px, 7vw, 48px);
  --spacing-64: clamp(40px, 8vw, 64px);
  --spacing-80: clamp(48px, 9vw, 80px);
}

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

body {
    font-family: var(--font-din-round);
    background-color: var(--color-snow-white);
    color: var(--color-almost-black);
    line-height: var(--leading-body);
    letter-spacing: 0.053em;
    overflow-x: hidden;
    /* Ensure room for mobile bottom nav */
    padding-bottom: env(safe-area-inset-bottom);
}

/* Base Typography */
h1, h2, h3 {
    font-family: var(--font-feather);
    color: var(--color-almost-black);
    line-height: var(--leading-heading);
}

/* Header */
.lpu-header {
    background-color: var(--color-snow-white);
    padding: var(--spacing-12) 0;
    border-bottom: 2px solid var(--color-cloud-gray);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-16);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: var(--spacing-12);
    text-decoration: none;
}

.main-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.title-area h1 {
    font-size: var(--text-heading-sm);
    color: var(--color-duo-green);
    margin: 0;
}

.title-area p {
    font-family: var(--font-din-round);
    font-size: var(--text-caption);
    color: var(--color-silver);
    margin: 0;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
}

/* Hide extra text on very small screens */
@media (max-width: 480px) {
    .title-area p {
        display: none;
    }
}

/* Hero Section */
.hero {
    padding: var(--spacing-48) var(--spacing-16) var(--spacing-32);
    text-align: center;
    max-width: 1024px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background-color: var(--color-duo-green-light);
    color: var(--color-duo-green);
    padding: 8px 16px;
    border-radius: 12px;
    font-size: var(--text-caption);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-16);
    text-transform: uppercase;
}

.hero-content h2 {
    font-size: var(--text-display);
    color: var(--color-duo-green);
    margin-bottom: var(--spacing-16);
}

.hero-content p {
    font-size: var(--text-body);
    color: var(--color-graphite);
    max-width: 600px;
    margin: 0 auto;
}

/* Main Container */
.home-container, .dashboard-container, .cb-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--spacing-24) var(--spacing-16);
}

/* Semesters Grid - Mobile First */
.semesters-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-16);
}

.sem-card {
    background-color: var(--color-snow-white);
    border: 2px solid var(--color-cloud-gray);
    border-radius: 16px;
    padding: var(--spacing-24) var(--spacing-16);
    text-align: center;
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-12);
    box-shadow: 0 4px 0 var(--color-cloud-gray);
    /* Touch Target Min Height */
    min-height: 80px; 
}

.sem-card:hover:not(.disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--color-cloud-gray);
}

.sem-card:active:not(.disabled) {
    transform: translateY(4px);
    box-shadow: 0 0px 0 var(--color-cloud-gray);
}

.sem-card.active-sem {
    border: 2px solid var(--color-cloud-gray);
}

.sem-card.disabled {
    opacity: 0.5;
    background-color: #f7f7f7;
    cursor: not-allowed;
    box-shadow: none;
}

.sem-card h3 {
    font-size: var(--text-heading-sm);
}

.badge {
    padding: 6px 12px;
    border-radius: 12px;
    font-size: var(--text-caption);
    font-weight: var(--font-weight-bold);
    background-color: var(--color-cloud-gray);
    color: var(--color-graphite);
    text-transform: uppercase;
}

.badge.success {
    background-color: var(--color-duo-green-light);
    color: var(--color-duo-green);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border-radius: 16px;
    font-family: var(--font-din-round);
    font-weight: var(--font-weight-bold);
    font-size: var(--text-body);
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
    text-decoration: none;
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.053em;
    min-height: 48px; /* Touch target minimum */
}

.btn-primary {
    background-color: var(--color-duo-green);
    color: var(--color-snow-white);
    box-shadow: 0 4px 0 #3f8f01;
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #3f8f01;
}

.btn-primary:active {
    transform: translateY(4px);
    box-shadow: 0 0px 0 #3f8f01;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-sky-blue);
    border: 2px solid var(--color-cloud-gray);
    box-shadow: 0 4px 0 var(--color-cloud-gray);
}

.btn-outline:hover {
    background-color: var(--color-cloud-gray);
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--color-cloud-gray);
}

.btn-outline:active {
    transform: translateY(4px);
    box-shadow: 0 0px 0 var(--color-cloud-gray);
}

.btn-block {
    width: 100%;
}

/* Controls */
.controls-section {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-24);
    gap: var(--spacing-16);
    background: var(--color-snow-white);
    padding: var(--spacing-16);
    border-radius: 16px;
    border: 2px solid var(--color-cloud-gray);
}

.cycle-toggle-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-16);
    width: 100%;
}

.toggle-label {
    font-weight: var(--font-weight-bold);
    color: var(--color-silver);
    text-transform: uppercase;
    font-size: var(--text-caption);
}

.toggle-label.active {
    color: var(--color-duo-green);
}

.switch {
    position: relative;
    display: inline-block;
    width: 64px;
    height: 36px;
    min-height: 44px; /* Touch target height included implicitly by its container or margin */
    margin: 4px 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--color-cloud-gray);
    border-radius: 36px;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 28px;
    width: 28px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    border-radius: 50%;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--color-duo-green);
}

input:checked + .slider:before {
    transform: translateX(28px);
}

/* Mobile Bottom Navigation Bar */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-snow-white);
    border-top: 2px solid var(--color-cloud-gray);
    padding: var(--spacing-12) var(--spacing-16);
    padding-bottom: calc(var(--spacing-12) + env(safe-area-inset-bottom));
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1000;
    gap: 8px;
}

.mobile-sgpa-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--color-duo-green-light);
    color: var(--color-duo-green);
    border-radius: 12px;
    padding: 6px 16px;
    min-height: 48px;
    flex: 1;
}

.mobile-sgpa-label {
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    line-height: 1;
    margin-bottom: 2px;
}

.mobile-sgpa-value {
    font-family: var(--font-feather);
    font-size: 20px;
    line-height: 1;
}

.mobile-bottom-nav .btn {
    flex: 1;
    padding: 12px 8px;
    font-size: var(--text-caption);
    min-height: 48px;
}

/* Desktop-only actions wrapper */
.desktop-actions {
    display: none;
}

/* Mobile-only actions wrapper */
.mobile-actions {
    display: block;
}


/* Dashboard Layout - Mobile First */
.dashboard-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-24);
    align-items: start;
    padding-bottom: 100px; /* Space for bottom nav */
}

.subjects-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-16);
}

.subject-card {
    background-color: var(--color-snow-white);
    border-radius: 16px;
    padding: var(--spacing-16);
    border: 2px solid var(--color-cloud-gray);
    transition: var(--transition);
    box-shadow: 0 4px 0 var(--color-cloud-gray);
}

.subject-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--color-cloud-gray);
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-16);
    padding-bottom: var(--spacing-16);
    border-bottom: 2px solid var(--color-cloud-gray);
}

.subject-title-area {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.subject-code {
    background-color: var(--color-duo-green-light);
    color: var(--color-duo-green);
    padding: 4px 8px;
    border-radius: 8px;
    font-weight: var(--font-weight-bold);
    font-size: var(--text-caption);
    align-self: flex-start;
}

.subject-title {
    font-family: var(--font-din-round);
    font-weight: var(--font-weight-bold);
    color: var(--color-almost-black);
    font-size: var(--text-body);
}

.subject-grade {
    font-family: var(--font-feather);
    font-size: var(--text-heading);
    color: var(--color-duo-green);
    line-height: 1;
}

.components-grid {
    display: grid;
    grid-template-columns: 1fr; /* Single column inputs on very small screens */
    gap: var(--spacing-16);
}

.input-group label {
    font-size: var(--text-caption);
    font-weight: var(--font-weight-bold);
    color: var(--color-charcoal);
    display: block;
    margin-bottom: 8px;
}

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

.input-wrapper input {
    width: 100%;
    padding: 14px;
    padding-right: 48px;
    border: 2px solid var(--color-cloud-gray);
    border-radius: 12px;
    font-family: var(--font-din-round);
    font-size: 16px; /* 16px prevents iOS zoom on focus */
    font-weight: var(--font-weight-bold);
    color: var(--color-almost-black);
    outline: none;
    min-height: 48px; /* Touch target */
    appearance: none;
}

.input-wrapper input:focus {
    border-color: var(--color-sky-blue);
}

.input-max {
    position: absolute;
    right: 14px;
    font-size: var(--text-caption);
    color: var(--color-silver);
    font-weight: var(--font-weight-bold);
}

.subject-footer {
    display: flex;
    align-items: center;
    margin-top: var(--spacing-16);
}

.progress-container {
    height: 16px;
    background-color: var(--color-cloud-gray);
    border-radius: 16px;
    overflow: hidden;
    margin-right: var(--spacing-12);
    flex-grow: 1;
}

.progress-bar {
    height: 100%;
    background-color: var(--color-duo-green);
    transition: width 0.5s ease;
}

.subject-total {
    font-weight: var(--font-weight-bold);
    color: var(--color-almost-black);
    font-size: var(--text-caption);
}

/* Sidebar */
.summary-card {
    background-color: var(--color-snow-white);
    border-radius: 16px;
    padding: var(--spacing-16);
    border: 2px solid var(--color-cloud-gray);
    transition: var(--transition);
    box-shadow: 0 4px 0 var(--color-cloud-gray);
}

.summary-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--color-cloud-gray);
}

.summary-card h3 {
    font-size: var(--text-heading-sm);
    margin-bottom: var(--spacing-16);
}

.summary-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-24);
}

.stat-box {
    padding: var(--spacing-12);
    border-radius: 12px;
    border: 2px solid var(--color-cloud-gray);
    text-align: center;
}

.stat-value {
    display: block;
    font-family: var(--font-feather);
    font-size: var(--text-heading);
    color: var(--color-almost-black);
    line-height: 1;
}

.stat-label {
    font-size: var(--text-caption);
    color: var(--color-graphite);
    font-weight: var(--font-weight-bold);
    margin-top: 4px;
}

.gpa-display {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-24);
}

.gpa-circle {
    position: relative;
    width: 120px;
    height: 120px;
}

.circular-chart {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    max-height: 100%;
}

.circle-bg {
    fill: none;
    stroke: var(--color-cloud-gray);
    stroke-width: 4;
}

.circle {
    fill: none;
    stroke: var(--color-duo-green);
    stroke-width: 4;
    stroke-linecap: round;
    transition: stroke-dasharray 1s ease-out;
}

.gpa-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.gpa-number {
    display: block;
    font-family: var(--font-feather);
    font-size: var(--text-heading);
    color: var(--color-duo-green);
    line-height: 1;
}

.gpa-label {
    font-size: var(--text-caption);
    font-weight: var(--font-weight-bold);
    color: var(--color-graphite);
}

.estimated-cgpa, .grade-distribution {
    margin-bottom: var(--spacing-24);
}

.estimated-cgpa h4, .grade-distribution h4 {
    font-size: var(--text-body);
    margin-bottom: var(--spacing-12);
}

.cgpa-bar-wrapper {
    height: 16px;
    background-color: var(--color-cloud-gray);
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 8px;
}

.cgpa-bar {
    height: 100%;
    background-color: var(--color-sky-blue);
    transition: width 1s ease-out;
}

.cgpa-val {
    text-align: right;
    font-weight: var(--font-weight-bold);
    color: var(--color-silver);
    font-size: var(--text-caption);
}

.cgpa-val strong {
    color: var(--color-almost-black);
}

.grade-list {
    list-style: none;
}

#grade-list li {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 2px solid var(--color-cloud-gray);
    font-weight: var(--font-weight-bold);
    font-size: var(--text-body);
}

#grade-list li:last-child {
    border-bottom: none;
}

.grade-badge {
    background-color: var(--color-duo-green-light);
    color: var(--color-duo-green);
    padding: 4px 12px;
    border-radius: 12px;
}

/* CodeBhumi */
.cb-header {
    text-align: center;
    margin-bottom: var(--spacing-24);
}

.cb-highlight {
    color: var(--color-duo-green);
}

.cb-cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-16);
    margin-bottom: var(--spacing-32);
}

.cb-card {
    background-color: var(--color-snow-white);
    border: 2px solid var(--color-cloud-gray);
    border-radius: 16px;
    padding: var(--spacing-24);
    transition: var(--transition);
    box-shadow: 0 4px 0 var(--color-cloud-gray);
}

.cb-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--color-cloud-gray);
}

.cb-icon {
    font-size: 32px;
    color: var(--color-duo-green);
    margin-bottom: var(--spacing-12);
}

.cb-card h3 {
    margin-bottom: var(--spacing-8);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-32) var(--spacing-16) calc(var(--spacing-32) + 80px); /* Extra padding for mobile nav */
    color: var(--color-graphite);
    font-weight: var(--font-weight-bold);
    border-top: 2px solid var(--color-cloud-gray);
    font-size: var(--text-caption);
}

/* Loader */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--color-snow-white);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
}

.page-loader.hidden {
    display: none;
}

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

.spinner {
    width: 60px;
    height: 60px;
    border: 6px solid var(--color-cloud-gray);
    border-top: 6px solid var(--color-duo-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.loader-text {
    font-family: var(--font-feather);
    color: var(--color-duo-green);
    font-size: var(--text-heading);
}

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

/* Duolingo button link specifically for a tag links */
.btn-cb {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-duo-green);
    color: var(--color-snow-white);
    box-shadow: 0 4px 0 #3f8f01;
    padding: 16px 32px;
    font-size: var(--text-body);
    font-weight: var(--font-weight-bold);
    border-radius: 16px;
    text-transform: uppercase;
    text-decoration: none;
    letter-spacing: 0.053em;
    min-height: 48px; /* Touch target */
}
.btn-cb:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #3f8f01;
}

.btn-cb:active {
    transform: translateY(4px);
    box-shadow: 0 0px 0 #3f8f01;
}

/* =========================================
   MEDIA QUERIES (Mobile First Progressive Enhancement)
   ========================================= */

/* Tablet (768px - 1024px) */
@media (min-width: 768px) {
    .main-logo {
        height: 48px;
    }
    
    .semesters-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
    
    .cb-cards-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .components-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .controls-section {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .cycle-toggle-wrapper {
        width: auto;
    }
}

/* Laptop (1024px - 1440px) */
@media (min-width: 1024px) {
    .dashboard-layout {
        grid-template-columns: 2fr 1fr;
        padding-bottom: 0; /* Remove bottom nav padding */
    }

    .sticky {
        position: sticky;
        top: 100px;
    }
    
    .components-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }

    footer {
        padding-bottom: var(--spacing-32); /* Restore regular footer padding */
    }

    /* Swap Navigation for Desktop */
    .mobile-bottom-nav {
        display: none;
    }

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

    .mobile-actions {
        display: none;
    }
}

/* Desktop (1440px+) */
@media (min-width: 1440px) {
    .home-container, .dashboard-container, .cb-section, .header-container {
        padding: var(--spacing-32) 0;
    }
}