/* About Us Page — aboutus.css */

/* Page wrapper */
.aboutus-main {
    padding-top: 0px;
}

/* SECTION 1 — Hero / About Us */
.au-hero-section {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    background-color: var(--primary-bg-color);
}

.au-hero-inner {
    max-width: 1100px;
    width: 100%;
}

.au-hero-title {
    font-size: 52px;
    text-align: center;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--primary-color);
    margin: 0 0 1.5rem;
    line-height: 1.1;
}

.au-hero-sub {
    font-size: 1rem;
    color: var(--primary-color);
    line-height: 1.8;
    margin: 0;
}

.au-hero-text-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem 1rem;
    margin-top: 2rem;
    text-align: left;
}

/* SECTION 2 — Our Mission */
.au-mission-section {
    position: relative;
    left: 50%;
    width: 100vw;
    transform: translateX(-50%);
    padding: 3rem 2rem;
    background-color: var(--secondary-bg-color);
    box-sizing: border-box;
    text-align: center;
}

.au-mission-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.au-section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.02em;
    margin: 0 0 3rem;
}

/* Three-column card grid */
.au-mission-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}

.au-mission-card {
    background: var(--primary-bg-color);
    border-radius: var(--border-radius-option);
    padding: 2.25rem 1.75rem;
    text-align: left;
    border: 1px solid var(--tertiary-bg-color);
    box-shadow: 0 8px 24px rgba(16, 24, 40, 0.05);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.au-mission-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(16, 24, 40, 0.11);
}

.au-mission-icon {
    width: 52px;
    height: 52px;
    background-color: var(--tertiary-bg-color);
    border-radius: var(--border-radius-button);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.au-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 0 0.65rem;
}

.au-card-text {
    font-size: 0.95rem;
    color: var(--secondary-color);
    line-height: 1.7;
    margin: 0;
}

/* SECTION 3 — Get Started CTA */
.au-cta-section {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem;
    background-color: var(--primary-bg-color);
    text-align: center;
}

.au-cta-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
}

.au-cta-heading {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--primary-color);
    margin: 0;
    line-height: 1.1;
}

.au-cta-sub {
    font-size: 1.05rem;
    color: var(--secondary-color);
    margin: 0;
    line-height: 1.6;
}

/* Browse Books button — mirrors .login-btn from auth.css */
.au-browse-btn {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 14px 2.5rem;
    background: var(--accept-bg-color);
    color: var(--primary-bg-color);
    border: none;
    border-radius: var(--border-radius-button);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    box-shadow: 0px 6px 14px rgba(10, 138, 115, 0.25);
    transition: opacity 0.2s ease-in-out;
}

.au-browse-btn:hover {
    opacity: 0.9;
}

/* RESPONSIVE — Tablet */
@media (max-width: 900px) {
    .au-hero-section {
        padding: 11rem 1.5rem 3rem;
    }

    .au-hero-title {
        font-size: 38px;
    }

    .au-mission-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .au-section-title {
        font-size: 28px;
    }

    .au-cta-heading {
        font-size: 32px;
    }
}

/* RESPONSIVE — Mobile */
@media (max-width: 600px) {

    .au-hero-section {
        padding: 12rem 1.25rem 3rem;
    }

    .au-hero-text-grid {
        grid-template-columns: 1fr;
    }

    .au-hero-title {
        font-size: 30px;
    }

    .au-mission-section {
        padding: 1.25rem;
    }

    .au-mission-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .au-cta-section {
        padding: 4rem 1.25rem;
    }

    .au-cta-heading {
        font-size: 26px;
    }

    .au-browse-btn {
        width: 100%;
        max-width: 320px;
        text-align: center;
    }
}

@media (max-width: 600px) {
    .au-hero-title { font-size: 32px; }
    .au-hero-text-grid { grid-template-columns: 1fr; }
}