/* ============================================================
   LAYOUT — container, seções, botões, helpers de tema
   ============================================================ */

/* ---------- Container ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--pad-x);
}

/* ---------- Seções ---------- */
.section {
    padding-block: var(--space-9);
}

.section-sm {
    padding-block: var(--space-7);
}

.section-head {
    max-width: clamp(390px, 50vw, 760px);
    margin-bottom: var(--space-7);
    display: grid;
    gap: var(--space-3);
}

.section-head.center {
    margin-inline: auto;
    text-align: center;
}

/* ---------- Temas ---------- */
.on-dark {
    background: var(--color-navy-deep);
    color: rgba(255, 255, 255, 0.74);
}

.on-dark h1,
.on-dark h2,
.on-dark h3,
.on-dark h4 {
    color: #fff;
}

.on-dark .muted {
    color: rgba(255, 255, 255, 0.55);
}

.bg-alt {
    background: var(--color-bg-alt);
}

.center {
    text-align: center;
}

/* ---------- Botões ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: var(--fs-base);
    padding: 0.85em 1.4em;
    border-radius: var(--radius-md);
    transition: all var(--t-med) var(--ease);
    white-space: nowrap;
    letter-spacing: -0.01em;
    line-height: 1.1;
    cursor: pointer;
}

.btn svg {
    width: 1.05em;
    height: 1.05em;
    transition: transform var(--t-med) var(--ease);
}

.btn-primary {
    background: var(--color-navy);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-navy-mid);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px -8px rgba(0, 30, 98, 0.5);
}

.btn-primary:hover svg {
    transform: translate(3px, -3px);
}

.btn-grad {
    background: var(--color-blue);
    color: #fff;
}

.btn-grad:hover {
    background: #005FA8;
    transform: translateY(-2px);
    box-shadow: 0 12px 26px -10px rgba(0, 114, 206, 0.5);
}

.on-dark .btn-grad {
    background: #fff;
    color: var(--color-navy-deep);
}

.on-dark .btn-grad:hover {
    background: #fff;
    color: var(--color-navy-deep);
    box-shadow: 0 14px 30px -10px rgba(0, 0, 0, 0.5);
}

.btn-grad:hover svg {
    transform: translate(3px, -3px);
}

.btn-ghost {
    border: 1.5px solid var(--line-strong);
    color: var(--color-heading);
}

.btn-ghost:hover {
    border-color: var(--color-navy);
    background: var(--color-navy);
    color: #fff;
}

.on-dark .btn-ghost {
    border-color: rgba(255, 255, 255, 0.28);
    color: #fff;
}

.on-dark .btn-ghost:hover {
    background: #fff;
    color: var(--color-navy);
    border-color: #fff;
}

/* ---------- Link com seta ---------- */
.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    font-weight: 600;
    color: var(--color-blue);
    transition: gap var(--t-fast) var(--ease);
}

.link-arrow svg {
    width: 1.05em;
    height: 1.05em;
    transition: transform var(--t-fast) var(--ease);
}

.link-arrow:hover {
    gap: 0.8em;
}

.link-arrow:hover svg {
    transform: translateX(3px);
}

/* ---------- Placeholder visual de imagem ---------- */
.ph {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background:
        repeating-linear-gradient(135deg, #E7EAF1 0 2px, transparent 2px 11px),
        var(--color-bg-alt);
    border: 1px solid var(--line);
    display: grid;
    align-items: end;
    color: var(--color-text-soft);
}

.ph::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--grad-soft);
    opacity: 0.5;
}

.ph-tag {
    position: relative;
    margin: var(--space-3);
    font-family: var(--font-mono);
    font-size: var(--fs-mono);
    letter-spacing: 0.02em;
    color: var(--color-navy);
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid var(--line);
    padding: clamp(3px, 0.4vw, 7px) clamp(6px, 0.7vw, 12px);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.ph.dark {
    background:
        repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0 2px, transparent 2px 11px),
        #0A1F55;
    border-color: var(--line-dark);
}

.ph.dark .ph-tag {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--line-dark);
}