/* ============================================================
   OSGLI — Ruangguru-Inspired Light Theme
   Shared design tokens & base styles
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    /* Primary palette */
    --rg-primary: #00A68C;
    --rg-primary-dark: #008F78;
    --rg-primary-light: #E0F7F3;
    --rg-secondary: #F26722;
    --rg-secondary-light: #FFF0E6;
    --rg-accent-blue: #2563EB;
    --rg-accent-blue-light: #EFF6FF;

    /* Neutrals */
    --rg-text: #1A2A44;
    --rg-text-secondary: #4B5563;
    --rg-text-muted: #64748B;
    --rg-border: #E5E7EB;
    --rg-border-light: #F3F4F6;

    /* Backgrounds */
    --rg-bg: #F8FAFC;
    --rg-bg-white: #FFFFFF;
    --rg-bg-hero: linear-gradient(135deg, #E0F7F3 0%, #D4EFFC 50%, #F0EBFF 100%);
    --rg-bg-hero-alt: linear-gradient(135deg, #00A68C 0%, #2563EB 100%);

    /* Card */
    --rg-card-shadow: 0 2px 12px rgba(0,0,0,0.06);
    --rg-card-shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
    --rg-card-radius: 16px;
    --rg-card-radius-lg: 24px;

    /* Button */
    --rg-btn-radius: 50px;
    --rg-btn-shadow: 0 4px 14px rgba(0,166,140,0.3);

    /* Test colors */
    --rg-itp: #2563EB;
    --rg-itp-light: #EFF6FF;
    --rg-toeic: #B45309;
    --rg-toeic-light: #FFFBEB;

    /* Fonts */
    --rg-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Transition */
    --rg-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Global Resets ---------- */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: var(--rg-font);
    color: var(--rg-text);
    background: var(--rg-bg);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

a {
    color: var(--rg-primary);
    text-decoration: none;
    transition: var(--rg-transition);
}

a:hover {
    color: var(--rg-primary-dark);
}

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

/* ---------- Container Override ---------- */
.container {
    max-width: 1200px;
}

/* ---------- Navbar — Clean White ---------- */
.rg-navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--rg-border);
    padding: 0.6rem 0;
    transition: var(--rg-transition);
}

.rg-navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.rg-navbar .navbar-brand {
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--rg-text) !important;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.rg-navbar .navbar-brand img {
    height: 36px;
}

.rg-navbar .nav-link {
    color: var(--rg-text-secondary) !important;
    font-weight: 500;
    font-size: 0.92rem;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: var(--rg-transition);
}

.rg-navbar .nav-link:hover,
.rg-navbar .nav-link.active {
    color: var(--rg-primary) !important;
    background: var(--rg-primary-light);
}

.rg-navbar .nav-link.active {
    font-weight: 600;
}

/* ---------- Buttons ---------- */
.btn-rg-primary {
    background: var(--rg-primary);
    color: #FFFFFF !important;
    border: none;
    padding: 0.65rem 1.75rem;
    border-radius: var(--rg-btn-radius);
    font-weight: 700;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: var(--rg-transition);
    cursor: pointer;
}

.btn-rg-primary:hover {
    background: var(--rg-primary-dark);
    color: #FFFFFF !important;
    transform: translateY(-2px);
    box-shadow: var(--rg-btn-shadow);
}

.btn-rg-secondary {
    background: var(--rg-secondary);
    color: #FFFFFF !important;
    border: none;
    padding: 0.65rem 1.75rem;
    border-radius: var(--rg-btn-radius);
    font-weight: 700;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: var(--rg-transition);
    cursor: pointer;
}

.btn-rg-secondary:hover {
    background: #D9551A;
    color: #FFFFFF !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(242,103,34,0.3);
}

.btn-rg-outline {
    background: transparent;
    color: var(--rg-primary) !important;
    border: 2px solid var(--rg-primary);
    padding: 0.6rem 1.75rem;
    border-radius: var(--rg-btn-radius);
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: var(--rg-transition);
    cursor: pointer;
}

.btn-rg-outline:hover {
    background: var(--rg-primary);
    color: #FFFFFF !important;
    transform: translateY(-2px);
    box-shadow: var(--rg-btn-shadow);
}

.btn-rg-white {
    background: #FFFFFF;
    color: var(--rg-text) !important;
    border: 1px solid var(--rg-border);
    padding: 0.65rem 1.75rem;
    border-radius: var(--rg-btn-radius);
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: var(--rg-transition);
    cursor: pointer;
}

.btn-rg-white:hover {
    border-color: var(--rg-primary);
    color: var(--rg-primary) !important;
    transform: translateY(-2px);
    box-shadow: var(--rg-card-shadow);
}

/* ---------- Cards ---------- */
.rg-card {
    background: var(--rg-bg-white);
    border: 1px solid var(--rg-border);
    border-radius: var(--rg-card-radius);
    box-shadow: var(--rg-card-shadow);
    padding: 1.75rem;
    transition: var(--rg-transition);
}

.rg-card:hover {
    box-shadow: var(--rg-card-shadow-hover);
    transform: translateY(-4px);
}

/* ---------- Section Headers ---------- */
.rg-section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.rg-section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--rg-text);
    margin-bottom: 0.75rem;
}

.rg-section-subtitle {
    color: var(--rg-text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ---------- Badges ---------- */
.rg-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.rg-badge-itp {
    background: var(--rg-itp-light);
    color: var(--rg-itp);
}

.rg-badge-toeic {
    background: var(--rg-toeic-light);
    color: var(--rg-toeic);
}

/* ---------- Avatar ---------- */
.rg-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--rg-primary), var(--rg-accent-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: white;
    cursor: pointer;
    border: 2px solid var(--rg-border);
    transition: var(--rg-transition);
    flex-shrink: 0;
}

.rg-avatar:hover {
    border-color: var(--rg-primary);
    box-shadow: 0 0 0 3px var(--rg-primary-light);
}

/* ---------- Dropdown Light ---------- */
.rg-dropdown {
    background: var(--rg-bg-white);
    border: 1px solid var(--rg-border);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    padding: 0.5rem;
    min-width: 200px;
}

.rg-dropdown .dropdown-item {
    color: var(--rg-text-secondary);
    border-radius: 8px;
    padding: 0.55rem 0.9rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--rg-transition);
}

.rg-dropdown .dropdown-item:hover {
    background: var(--rg-primary-light);
    color: var(--rg-primary);
}

.rg-dropdown .dropdown-item.text-danger {
    color: #EF4444 !important;
}

.rg-dropdown .dropdown-item.text-danger:hover {
    background: #FEF2F2;
}

.rg-dropdown .dropdown-divider {
    border-color: var(--rg-border-light);
    margin: 0.3rem 0;
}

/* ---------- Footer ---------- */
.rg-footer {
    background: #1A2A44;
    color: rgba(255,255,255,0.8);
    padding: 3.5rem 0 1.5rem;
}

.rg-footer h5 {
    color: #FFFFFF;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 1.25rem;
}

.rg-footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.rg-footer-links li {
    margin-bottom: 0.6rem;
}

.rg-footer-links a {
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--rg-transition);
}

.rg-footer-links a:hover {
    color: #FFFFFF;
}

.rg-footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
    margin-top: 2.5rem;
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 0.85rem;
}

.rg-footer-bottom a {
    color: var(--rg-primary);
}

/* ---------- Form Styles ---------- */
.rg-form-control {
    border: 2px solid var(--rg-border);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    color: var(--rg-text);
    background: var(--rg-bg-white);
    transition: var(--rg-transition);
    width: 100%;
}

.rg-form-control:focus {
    border-color: var(--rg-primary);
    box-shadow: 0 0 0 3px var(--rg-primary-light);
    outline: none;
}

.rg-form-control::placeholder {
    color: var(--rg-text-muted);
}

.rg-form-floating .form-control {
    border: 2px solid var(--rg-border);
    border-radius: 12px;
    padding: 1rem 0.75rem;
    font-size: 1rem;
    color: var(--rg-text);
    background: var(--rg-bg-white);
    transition: var(--rg-transition);
    height: 58px;
}

.rg-form-floating .form-control:focus {
    border-color: var(--rg-primary);
    box-shadow: 0 0 0 3px var(--rg-primary-light);
    color: var(--rg-text);
}

.rg-form-floating label {
    color: var(--rg-text-muted);
    font-weight: 500;
    padding: 1rem 0.75rem;
}

/* ---------- Alert overrides ---------- */
.rg-alert-danger {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: 12px;
    color: #B91C1C;
}

.rg-alert-success {
    background: #ECFDF5;
    border: 1px solid #A7F3D0;
    border-radius: 12px;
    color: #065F46;
}

.rg-alert-warning {
    background: #FFFBEB;
    border: 1px solid #FDE68A;
    border-radius: 12px;
    color: #92400E;
}

/* ---------- Animations ---------- */
@keyframes rgFadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

.rg-fade-in {
    animation: rgFadeInUp 0.5s ease forwards;
}

.rg-delay-1 { animation-delay: 0.08s; opacity: 0; }
.rg-delay-2 { animation-delay: 0.16s; opacity: 0; }
.rg-delay-3 { animation-delay: 0.24s; opacity: 0; }
.rg-delay-4 { animation-delay: 0.32s; opacity: 0; }

/* ---------- Responsive Navbar Toggler ---------- */
.rg-navbar .navbar-toggler {
    border: 1px solid var(--rg-border);
    padding: 0.35rem 0.6rem;
}

.rg-navbar .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%234B5563' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ---------- Scroll behavior ---------- */
html {
    scroll-behavior: smooth;
}

/* ---------- Typography utilities ---------- */
.text-rg-primary { color: var(--rg-primary) !important; }
.text-rg-secondary { color: var(--rg-secondary) !important; }
.text-rg-muted { color: var(--rg-text-muted) !important; }
.bg-rg-primary { background-color: var(--rg-primary) !important; }
.bg-rg-light { background-color: var(--rg-bg) !important; }