/*
Theme Name: CGPA Calculator
Theme URI: https://example.com/cgpa-calculator
Author: Antigravity
Author URI: https://example.com
Description: A modern, beautiful CGPA Calculator.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: cgpa-calculator
*/

/* ===== CSS Design System ===== */
:root {
    /* Colors */
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: rgba(20, 20, 50, 0.6);
    --bg-card-hover: rgba(30, 30, 65, 0.7);
    --bg-input: rgba(15, 15, 40, 0.8);
    --border-color: rgba(100, 100, 255, 0.12);
    --border-glow: rgba(100, 130, 255, 0.3);
    --text-primary: #e8e8f0;
    --text-secondary: #9090b8;
    --text-muted: #5a5a80;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-glow: rgba(108, 92, 231, 0.35);
    --success: #00cec9;
    --success-glow: rgba(0, 206, 201, 0.3);
    --warning: #fdcb6e;
    --danger: #ff6b6b;
    --danger-glow: rgba(255, 107, 107, 0.3);
    --gradient-1: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%);
    --gradient-2: linear-gradient(135deg, #00cec9 0%, #55efc4 100%);
    --gradient-3: linear-gradient(135deg, #fd79a8 0%, #fdcb6e 100%);
    --gradient-4: linear-gradient(135deg, #0984e3 0%, #74b9ff 100%);
    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    /* Shadows */
    --shadow-card: 0 8px 32px rgba(0,0,0,0.3), 0 2px 8px rgba(0,0,0,0.2);
    --shadow-glow: 0 0 30px var(--accent-glow);
    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* ===== Animated Background Orbs ===== */
.bg-orbs {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.25;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--accent);
    top: -150px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: #00cec9;
    bottom: -100px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: #fd79a8;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(40px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 40px) scale(0.95); }
    75% { transform: translate(30px, 20px) scale(1.02); }
}

/* ===== Header ===== */
.header {
    position: relative;
    z-index: 1;
    padding: 40px 20px 20px;
    text-align: center;
}

.header-content {
    max-width: 700px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 8px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: var(--gradient-1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* ===== Main ===== */
.main {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 20px 40px;
}

/* ===== Dashboard ===== */
.dashboard {
    margin-bottom: 28px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    text-align: center;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

/* CGPA Ring */
.stat-cgpa {
    grid-column: 1 / 2;
    grid-row: 1 / 2;
}

.stat-ring {
    position: relative;
    width: 100px;
    height: 100px;
}

.stat-ring svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.ring-bg {
    fill: none;
    stroke: rgba(108, 92, 231, 0.12);
    stroke-width: 8;
}

.ring-fill {
    fill: none;
    stroke: url(#ringGradient);
    stroke: var(--accent-light);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 326.73;
    stroke-dashoffset: 326.73;
    transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-value {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-sublabel {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-credits .stat-icon { background: rgba(0, 206, 201, 0.15); color: var(--success); }
.stat-courses .stat-icon { background: rgba(253, 121, 168, 0.15); color: #fd79a8; }
.stat-semesters .stat-icon { background: rgba(9, 132, 227, 0.15); color: #74b9ff; }

.stat-credits .stat-number { color: var(--success); }
.stat-courses .stat-number { color: #fd79a8; }
.stat-semesters .stat-number { color: #74b9ff; }

/* ===== Grading Scale ===== */
.grading-scale-section {
    margin-bottom: 28px;
}

.grading-toggle {
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 20px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.grading-toggle:hover {
    border-color: var(--border-glow);
    color: var(--text-primary);
}

.grading-toggle .chevron {
    margin-left: auto;
    transition: transform var(--transition);
}

.grading-toggle.active .chevron {
    transform: rotate(180deg);
}

.grading-scale {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid transparent;
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.grading-scale.open {
    max-height: 200px;
    padding: 16px 20px;
    border-color: var(--border-color);
}

.grade-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.grade-chip {
    background: rgba(108, 92, 231, 0.1);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent-light);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.grade-chip:hover {
    background: rgba(108, 92, 231, 0.2);
    transform: translateY(-1px);
}

.grade-chip small {
    color: var(--text-muted);
    font-weight: 400;
}

.grade-chip.fail {
    background: rgba(255, 107, 107, 0.1);
    border-color: rgba(255, 107, 107, 0.2);
    color: var(--danger);
}

/* ===== Semester Card ===== */
.semester-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    overflow: hidden;
    transition: var(--transition);
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.semester-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-card);
}

.semester-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
}

.semester-title-group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.semester-number {
    width: 36px;
    height: 36px;
    background: var(--gradient-1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: #fff;
    flex-shrink: 0;
}

.semester-name-input {
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.05rem;
    font-weight: 600;
    width: 100%;
    max-width: 300px;
    transition: var(--transition);
}

.semester-name-input:hover {
    border-color: var(--border-color);
}

.semester-name-input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg-input);
}

.semester-gpa-badge {
    background: rgba(108, 92, 231, 0.12);
    border: 1px solid rgba(108, 92, 231, 0.25);
    border-radius: 20px;
    padding: 6px 16px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-light);
    white-space: nowrap;
    flex-shrink: 0;
}

.semester-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.btn-icon {
    width: 34px;
    height: 34px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.btn-icon:hover {
    border-color: var(--border-glow);
    color: var(--text-primary);
    background: rgba(255,255,255,0.03);
}

.btn-icon.btn-delete:hover {
    border-color: var(--danger);
    color: var(--danger);
    background: rgba(255, 107, 107, 0.08);
}

.btn-icon svg {
    width: 16px;
    height: 16px;
}

/* ===== Course Table ===== */
.courses-table {
    width: 100%;
    border-collapse: collapse;
}

.courses-table thead th {
    padding: 12px 16px;
    text-align: left;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.courses-table thead th:last-child {
    text-align: center;
    width: 50px;
}

.courses-table tbody tr {
    transition: background var(--transition);
}

.courses-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.courses-table tbody td {
    padding: 8px 16px;
    border-bottom: 1px solid rgba(100, 100, 255, 0.06);
    vertical-align: middle;
}

.courses-table tbody tr:last-child td {
    border-bottom: none;
}

.course-input {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    width: 100%;
    transition: var(--transition);
}

.course-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.course-input::placeholder {
    color: var(--text-muted);
}

select.course-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239090b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

select.course-input option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

input[type="number"].course-input {
    max-width: 80px;
    text-align: center;
    -moz-appearance: textfield;
}

input[type="number"].course-input::-webkit-outer-spin-button,
input[type="number"].course-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.btn-remove-course {
    width: 30px;
    height: 30px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    margin: 0 auto;
}

.btn-remove-course:hover {
    color: var(--danger);
    background: rgba(255, 107, 107, 0.1);
}

.btn-remove-course svg {
    width: 16px;
    height: 16px;
}

/* Semester Footer */
.semester-footer {
    padding: 12px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.btn-add-course {
    background: transparent;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 18px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.btn-add-course:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: rgba(108, 92, 231, 0.06);
}

.btn-add-course svg {
    width: 16px;
    height: 16px;
}

.semester-credits-info {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
}

.semester-credits-info span {
    color: var(--text-secondary);
    font-weight: 600;
}

/* ===== Buttons ===== */
.btn {
    border: none;
    border-radius: var(--radius-md);
    padding: 14px 28px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.btn-add-semester {
    width: 100%;
    justify-content: center;
    background: var(--gradient-1);
    color: #fff;
    padding: 16px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-add-semester:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

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

.add-semester-container {
    margin-bottom: 24px;
}

/* Actions Bar */
.actions-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-reset {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.2);
    color: var(--danger);
}

.btn-reset:hover {
    background: rgba(255, 107, 107, 0.18);
    border-color: var(--danger);
    box-shadow: 0 4px 20px var(--danger-glow);
}

.btn-export {
    background: rgba(0, 206, 201, 0.1);
    border: 1px solid rgba(0, 206, 201, 0.2);
    color: var(--success);
}

.btn-export:hover {
    background: rgba(0, 206, 201, 0.18);
    border-color: var(--success);
    box-shadow: 0 4px 20px var(--success-glow);
}

/* ===== Footer ===== */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 30px 20px;
    color: var(--text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-md);
    padding: 14px 28px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-card);
    z-index: 1000;
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr 1fr;
    }

    .stat-cgpa {
        grid-column: 1 / -1;
    }

    .semester-header {
        flex-wrap: wrap;
        padding: 16px;
    }

    .semester-name-input {
        max-width: 100%;
    }

    .courses-table thead {
        display: none;
    }

    .courses-table tbody tr {
        display: flex;
        flex-wrap: wrap;
        padding: 12px 16px;
        gap: 8px;
        border-bottom: 1px solid var(--border-color);
    }

    .courses-table tbody td {
        border: none;
        padding: 0;
    }

    .courses-table tbody td:nth-child(1) {
        flex: 1 1 100%;
    }

    .courses-table tbody td:nth-child(2),
    .courses-table tbody td:nth-child(3) {
        flex: 1;
    }

    .courses-table tbody td:last-child {
        flex: 0;
    }

    .semester-footer {
        flex-direction: column;
        gap: 12px;
        padding: 12px 16px;
    }

    .actions-bar {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.5rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .stat-cgpa {
        grid-column: auto;
    }
}

/* ===== Utility Animations ===== */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.removing {
    animation: slideOut 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideOut {
    to {
        opacity: 0;
        transform: translateX(-20px) scale(0.97);
        max-height: 0;
        padding: 0;
        margin: 0;
        overflow: hidden;
    }
}

/* Focus visible for accessibility */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(108, 92, 231, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(108, 92, 231, 0.5);
}